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HTML/CSS

Learn HTML
HyperText Markup Language is a standard markup language for creating web pages
Learn CSS
Cascading StyleSheet

JavaScript

Learn JavaScript
JavaScript is the programming language of HTML and the Web.
Learn jQuery
jQuery is a JavaScript Library greatly simplifies JavaScript programming.
Learn JSON
JSON is the syntax for storing and exchanging text information
Learn Node.js
Node.js is JavaScript running on the server
Learn React
A JavaScript library for building user interfaces
Learn TypeScript
TypeScript brings you optional static type-checking along with the latest ECMAScript features
Learn Vue.js
The Progressive JavaScript Framework
Learn HTML DOM
Document Object Model
Learn AJAX
Asynchronous JavaScript and XML

Programming

Learn C
A general computer programming language
Learn C++
C ++ is a general-purpose programming language developed on the basis of C language
Learn Go
Go is a new programming language from Google
Learn java
Java is used to develop mobile apps, web apps, desktop apps, games and much more.
Learn Lua
Lua is a lightweight and compact scripting language written in standard C and open source
Learn PHP
PHP is a universal open source scripting language
Learn Python
Python3.x version, future mainstream version.
Learn Ruby
A scripting language for simple and fast object-oriented programming (object-oriented programming)

DataBase

Learn SQL
Structured Query Language
Learn MySQL
MySQL is a relational database management system
Learn MangoDB
Mongo DB is a non-relational database (NoSql) that is very popular in the IT industry