Cryptocurrency, also known as cryptocurrency, is a technology that deserves attention. In fact, many young people have been earning income from these cryptocurrencies. Although this coin has not been recognized by many organizations, it is still a money-making tool. Please download the course to make money online from Cryptocurrency for newbies.

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You need to learn to understand what it is and how it works. When you have enough experience, you can start fighting to make money. Now I will briefly analyze Cryptocurrency to show you some of its outstanding features!!

Cryptocurrency and outstanding features

The decentralized management system of Cryptocurrency is one of the highlights of this coin. Users are allowed to control the money supply and value through an encrypted cryptographic protocol. There is absolutely no interference from 3rd parties and intermediary banks. That also increases customer safety.

Cryptocurrency allows cash transactions at exchanges. After Bitcoin, perhaps this is a currency worth trusting according to the analysis of experts. In this course, you will be taught how to analyze, how to understand how it works.

From there, you will be guided to practice your judgment and capture currency rates yourself. This course is currently priced at 1,200,000 VND at Unica and I have checked the quality. The course duration is short but the instruction is quite complete in terms of skills and tools.

What will you learn after the course?

• Get a basic knowledge of crypto traders.
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• Know what to do from scratch.
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Lmint.

If you are a enthusiast programming game then you must have heard about Unity, Unreal Engine 4, CryEngine… Most of the above Engines are written in C#, C++ which is easy to learn but difficult to use for beginners. Therefore, today I will introduce to you a new and emerging Game Engine that is Godot Engine.

Godot Engine is open source software. The editor and all accompanying tools are freely licensed by MIT. Because it’s free, you can own everything created with this tool. Especially with a large user community, you can use unique features shared by the community.

What is Godot Engine?

Godot Engine created by Juan ‘reduz’ Linietsky and Ariel ‘punto’ Manzur in 2007. The name Godot was given in reference to Samuel Beckett’s play Waitting For Godot. Doesn’t it sound ridiculous, the name of a play is given to an emerging software.

Godot was released in February 2014. The source code of Godot has been released to the public on GitHub under the MIT License. Being compared to Unity and UE4 is like two tool makers who have created a brand for decades but are always compared to a newbie.

Feature:

You can program with Godot Engine even without learning to program

Most Game Engines now require national languages ​​such as C++, C#… But Godot is full, it supports from basic to advanced such as: C++, C#, Python, Java, Lua, VisualScripts… Especially In particular, it has its own language, but GdScript is created based on Python and Lua. While most other languages ​​do not support their own languages. And Now Godot is experimenting with languages ​​like Go, R, Nim, Rust and Ruby. Those of you who like to make games should refer to those languages. In the future, Godot is expected to link with most languages.

Especially it is very easy to program and write code. With the API there are most of the elements of a game development tool and very few features that cannot be accessed directly by code.

The Node System supports fast and lightweight

Most Game Engines use sence to perform a level in the game. In Unity, it seems to be GameObject, UE is Actors. For Godot Engine is Node.

Node is an object and inherits from other nodes. This explanation will be very confusing for those who have never used it, so I will talk about it in the video tutorial.

Support 2D, 3D and Open Source Game development

Godot supports creating 2D and 3D games. Most of the Indie developers who create games like this tool because of the convenience it brings. Instead of creating a pseudo 2D space (a 3D world represented in two dimensions), Godot operates in a real 2D space represented in pixels. This simplifies 2D game creation and optimization.

Newer 3D support but still slower than Unreal Engine and Unity. However, unless you’re building an AAA game with top graphics, you won’t face any limitations when using it on Godot.

Godot has nodes for both 2D and 3D, with some designed to work in both and support for 2.5D coming soon.

Lightweight, Cross-Platform Support, Its Own IDE

Currently Godot version 3.1.2 its capacity is: 50.8 MB. If you install templates, it’s 200MB very light, isn’t it?

Godot supports many platforms such as: Linux, Windows, MacOS, Server very convenient.

Godot has a built-in IDE, which doesn’t have the cool features of other IDEs like VSCode’s Live Share, but it’s ideal for use with Godot. Of course, you are not required to use the built-in IDE in this tool and can use other IDEs or text editors to program in GoDot.

Link Download Godot Engine

Godot supports all popular operating systems today. You can download Godot Engine to install and experience making Games like a programmer.

Windows

MacOS

Linux

Server

In the next articles, I will show you how to use Godot Engine to make a simple game.

DeathGM

Python is a general-purpose interpreted programming language that has now made its mark in the world of Computer Science and most importantly, for cybersecurity.

This is not a standalone article that just explains what python is and introduces some basic commands. This article will be the starting point for other cybersecurity python articles. Note that during this process I will be using Python3 on Ubuntu 18.04.

The first step when learning python

Python can be installed from the standard linux apt repositories by entering the command sudo apt-get install python3 to install python3 in your machine. To use python you just need to type python in your Terminal it will take you to python’s shell.

robin@python:~$ python3
Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

For Windows, you download Python For Windows, when installing at the first screen remember to select Add Path…. After the installation is complete, open CMD and type the command python see if it works.

The basic concepts

Starting with the basics, I’ll explain the different concepts that will be used to understand what you’re doing and will also help you debug the program.

Variable

A variable that points to data stored in a memory location. A memory can typically hold strings, real numbers, Boolean values, integers, or more complex data types such as sets, lists, and dictionaries.

Note: In Python, you don’t have to explicitly define the data type like C/C++. Python strings can be enclosed in single or double quotes, no different than PHP/Perl.

Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a_string = "Hello" # A string in duble quotations
>>> a_string
'Hello'
>>> a_string = 'Hello' # A string in single quotations
>>> a_string
'Hello'
>>> num = 5 # A integer value
>>> num
5
>>> float = 1.34 # A float value
>>> float
1.34
>>> Boolean = True # A boolean value
>>> Boolean
True
>>>

Above, I have declared different types of variables without having to define them like C++.

Chain

String is an immutable object in python which means that once created, you cannot change its contents (for those of you who don’t understand this, then read this post and this lesson again). As said before, it doesn’t matter if you use single or double quotes. Jaw len used to get the length of the string.

>>> var = "Hello, this is a string"
>>> var
'Hello, this is a string'
>>> new_var="Hello, this is a string"
>>>new_var
'Hello, this is a string'

Integers and Reals

An integer in python can be either negative or positive because it doesn’t require any stipulation of variable data type like unsigned and signed integer in C.

>>> a_int = 5
>>> a_int
5
>>> a_float = 1.43
>>> a_float
1.43

As you can see, there is no need to declare variables, we can save a lot of time and quickly use new objects.

List, Set and Dictionary

List

List is a collection of homogeneous or heterogeneous data types which means we can store different data types in the same list. A list can contain duplicate data. To access the data in the list, you can use the index (index), ie the position of the element in the list.

>>> lists
["A","B","C","D"]
>>> lists[0] # value atposition zero
'A'

Set

On the other hand, set is a mutable data type that can be used to store different data types but does not contain duplicated data.

>>> lists = ["A","B","C","D","A","B"]
>>> set(lists)
["A","B","C","D"]

Dictionary

Dictionary is a hash table containing keys and their corresponding values. It has O(1) access time which means it takes a constant amount of time to retrieve the data. A value in a dictionary can be accessed from keys.

>>> dictionary
{'Foo': 'Bar', 'Bacon': 'Fish'}
>>> dictionary['Foo']
'Bar'
>>> dictionary['Bacon']
'Fish'

Input

Syntax input used to get input from the user in Terminal. By default, the input value will be a string. But you can also cast the data type from string to number by adding functions like int(), float() outside the jaw input().

#!/usr/bin/env python3

name = input("Enter Name: ")
age = int(input("Enter age:" )) # Chuyển chuỗi sang số nguyên
height = float(input("Enter height: ") #Chuyển chuỗi sang số thực

First, the variable name will take a string as input and age will take an integer as input while the height variable will take a real number as input. If any other type of object is imported, it will result in an exception error (Exception).

Operator

• + : Concatenate two strings or add two integers/reals.
• - : Subtract integers/reals.
• = : Used to assign a value to a variable.
• == : Used to compare two similar variables with the same data type. For example 1 == 1, the result will be True.
• != : Used to compare two variables with the same data type. For example 1 != 1, the result will be False.
• % : Divide by integer part of 2 numbers. Example 10 % 3 = 3.
• * : Used to multiply a value. It is also possible to multiply strings. Eg: 'Ad' + ' dep trai' * 5the result will be Ad dep trai dep trai dep trai dep trai dep trai.
• >= and <= : Used to compare greater than or equal to and less than or equal to.
• and : The AND operator will return True if all conditions are satisfied.
• or : The OR operator will return True if only one of the conditions is satisfied.
• not: Negation operator. For example, not True would be False.

Command flow control

If, elif and else . statements

These statements are called conditional statements. Used to test a condition then perform data processing.Example:

user = input("Enter Username: ")
password = input("Enter Password: ")

if user == "admin" and password == "123":
    print("Welcome Admin")
elif user == "guest" and password == "guest":
    print("Welcome Guest")
else:             
    print("Wrong credentials")

user and password are all variables and receive input from the user using the function input. In line 6, we have an if statement to check if user is equal to the string “admin” and password equals the string “123” or not. Commands and is used to ensure that both conditions are True. On line number 8, we are checking if user and password is equal to “guest” or not. On line 10, the command printwill be run if the above two conditions are not satisfied.

for . loop

Commands for..in is a loop statement, repeating the command as many times as the user wants.

num = 5
for i in range(num):
    print(i) # Will print 0,1,2,3,4

In line 2, there is a for..in statement that uses the function rangeto iterate from 0 to 4. The for loop can be used to iterate over different data types like list, string, etc.

while . loop

The while statement allows you to repeat a block of statements as long as a condition is true. Eg:

num = 0
while num < 10:
    num += 1
print(num)

On line 1, we have the variable num assigned the value 0. Line 2 has a while statement that will be run until the num value is equal to or greater than 10 then stop. On line 3, we increment num by 1 after each iteration. So in line 4 we will get the value 10.

Jaw

Functions are reusable parts of the program. They allow you to name a block of statements, allow you to run the block by calling the specified name anywhere in your program, and unlimited number of calls.

The structure of the function:

def func_name(arg):
   -- your code --
return result

Key worddef at the top to define a function. func_name will be the name of the function. arg is the parameter and return for the final result. In python, a function is not required to have return.

Exceptions –Exception

Exceptions occur when special situations occur in your program. For example, what if you’re reading a file and the file doesn’t exist? Or what if you accidentally delete it while the program is running? Such situations are handled using exceptions (Exceptions).

Example of a function call print simple. What if we misspelled Print? In this case, Python will give a syntax error.

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'Print' is not defined
>>> print("Hello World")
Hello World

Handling exceptions

We can handle exceptions using the . statement try..except. Basically, we put the usual statements in the block try and put all the error handling cases in the block except.

try:
    text = input('Enter something --> ')
except EOFError:
    print('Why did you do an EOF on me?')
except KeyboardInterrupt:
    print('You cancelled the operation.')
else:
    print('You entered {}'.format(text))

We put all statements that can generate exceptions/errors inside the block try and then put handling commands for errors/exceptions in except. Exceptcan handle a specified error or exception, or a list of errors/exceptions enclosed in parentheses. If no error or exception name is provided, it will handle all errors and exceptions.

Library module

The same way you reuse code like in functions. You can also reuse the code of another program in another file. It’s called a library module.

A library module can be used by another program to use its functionality. This is how we can use the Python standard library. First, we’ll see how to use the standard library modules.

import sys

print('The command line arguments are:')
for i in sys.argv:
    print(i)

print('\n\nThe PYTHONPATH is', sys.path, '\n')

Access the sys library using the command import. Basically, this means we tell Python that we want to use this module. The sys module contains functions related to the Python interpreter and the system and environment.

When Python executes the import sys statement, it looks for the sys module. In this case, it’s one of the built-in modules, and so Python knows where to look.

summary

Python is one of the most loved and popular languages. It is also used in many different areas such as web, app, security. You can read more python articles here. Also, to write Python code, I recommend using Sublime Text 3 or Visual Studio Code.

A lot of Windows users have never even touched Command Prompt aka CMD. With today’s advanced operating systems, it’s easy to use the computer without worrying about entering text commands in the Command Prompt.

However, you should also be familiar with the Command Prompt in Windows. It helps you interact with the operating system more and can do more useful tasks. So, in this article, I will acquaint you with Command Prompt.

Command Prompt – What is CMD?

Command Prompt, officially known as Windows Command Processor and often abbreviated as CMD, is a command line interface for the Windows operating system. The command line interface is a way of directly interacting with the computer using text commands.

The early days of the computer age, when you had to type commands into a terminal to execute processes. Early PC operating systems, such as MS-DOS, operated exclusively through a command line interface. There are no mouse pointers, window managers or other graphical user interface (GUI) elements as we are used to seeing today.

Another term you should know is “shell”, which is used to describe a program that allows the user to issue commands to the computer. So the command line interface, as well as the GUI, are shells.

Early versions of Windows, such as Windows 3.1, operated as a DOS-based visual interface. Later versions, including Windows 95 through Windows ME, also included MS-DOS.

Starting with Windows XP, Windows broke away from MS-DOS. However, in modern versions of Windows, you can still use the Command Prompt to chat directly with your computer instead of clicking through various graphical menus. Command Prompt can also run batch files, which is a great way to automate tasks.

Advanced users prefer to use the Command Prompt for some tasks, although you can also perform these tasks with a few simple keystrokes, which will require dozens of presses in the GUI interface.

How to open CMD in Windows 10

There are several ways to open Command Prompt in Windows. Here are the most common ways:

Method 1: Type “command prompt” into the Start menu to search. You can also type “cmd” (which stands for Command Prompt) if you want.

Method 2: Press Win + R to open the Run box, then type “cmd” and press Enter to open the box.

Method 3: Press Win + X (or right-click the Start menu) and select Command Prompt. Depending on your Windows installation, you may see Windows PowerShell. PowerShell is more powerful than Command Prompt but still runs all the same commands.

Whichever you use above, open Command Prompt with normal permissions. A lot of useful commands require you to have administrator privileges.

To run Command Prompt as administrator, hold Ctrl + Shift as you launch either of the first two options above. If you use the third option, choose Command Prompt (Admin) instead. The computer will ask you to accept UAC authentication, so you will need to either log in to an administrator account or provide an administrator password.

Command Prompt Basics

When you open the Command Prompt window, you’ll see some basic information about your current version of Windows. Then you will see a line like this:

C:\Users\Username>

This is your current directory location. Any commands you run based on location (such as deleting files) will take place in this directory. The other CMD commands are more generic and do not depend on the current directory location.

It is important to know that when working in the Command Prompt, you must enter the correct commands. Since you’re issuing commands directly to your computer, it won’t understand if you type it wrong.

If you enter a command that your computer doesn’t recognize, you’ll see a message that says [Lệnh] unrecognized… and Windows won’t do anything.

This isn’t really a problem, it saves you the risk of accidentally typing the wrong command or using the command in an unexpected way. For example, when trying to delete a file, you may accidentally tell cmd to delete an entire directory.

The command line will run whatever command you type, as long as it’s valid. So you should always double check what you’re about to do before you start.

Command Prompt Basics for Beginners

There are many Command Prompt commands and most of them are not intuitive for newbies. Learning these commands takes time, so it’s best to slowly build up your knowledge rather than learning to dance.

You can also see more articles about my cmd command here.

How to view command instructions

Command help will list many common commands you can use. This command will also explain each command for you to use, so you don’t need to waste time looking for it.

If you want more specific information on how to use a certain command, type that command and add /?. This option will give you more help, along with additional options to modify how the command works.

List and change directory

Command dirstands for directory, will list the contents of the current directory. As mentioned earlier, you can check the current directory location by looking at the first command on the left.

To change current directory location, use CD (stands for change directory) followed by the directory you want to access. The available directories are highlighted when you run the dir command.

For example, to move to the Desktop folder from the default folder, you would type cd Desktop. And to move back one directory, use the command key CD..

Create, delete files and folders

Use mkdir [tên thư mục mới] to create a new folder. Eg: mkdir Awesome Pics will create a folder called Awesome Pics.

The same, similar, rmdir [tên thư mục] will delete a directory, but only if it is empty. To delete a file, use del [tên tệp].

Manage CMD

If there’s too much clutter on the Command Prompt screen, type cls to delete the command content. And if there is a running command that you want to cancel, press Ctrl + C to end it.

Network test command

Some of the most useful Command Prompt commands are related to networking. Commands like ping allows you to see if your computer can connect to the site and how long it takes. Meanwhile, the command ipconfig allows you to see the network overview of the current connection.

Now you are familiar with the basic commands in Command Prompt, even if you have never used CMD before. Some tasks, such as file and folder management, can be confusing if you’re used to the GUI. But for other tasks, like checking your IP address, running the CMD command is much faster and more convenient than using the GUI.

While most CMD commands are specific to the Windows environment, Windows 10 now also lets you run the Bash shell used by Linux, macOS, and many other operating systems using WSL.