HTML & CSS
- Codecademy – Learn to Code – for Free | Codecademy
- freeCodeCamp – Learn to Code — For Free — Coding Courses for Busy People
- W3Schools – W3Schools Online Web Tutorials
- Khan Academy – Intro to HTML/CSS: Making webpages | Khan Academy
- Coddy Tech – Learn HTML — Free Interactive Course | Coddy
- MDN Web Docs (Mozilla) – MDN Web Docs
Python & C++
- Codefinity – Codefinity
- Learn Python – https://www.learnpython.org/
- W3Schools – W3Schools Online Web Tutorials
- Real Python – Python Tutorials – Real Python
- Kaggle – Learn Python | Kaggle
- Learn C++ – Learn C++ – Skill up with our free tutorials
- Microsoft Learn – Microsoft C/C++ Documentation | Microsoft Learn
JavaScript
- Udemy – The Complete JavaScript Course 2025: From Zero to Expert!
- Codecademy – JavaScript Courses & Tutorials | Codecademy
- The Odin Project – JavaScript | The Odin Project
- JavaScript.Info – The Modern JavaScript Tutorial
- Eloquent JavaScript (Book) – Eloquent JavaScript
Java & SQL
- Coddy – Learn Java — Free Interactive Course | Coddy
- Coursera – Database Management with Java and SQL | Coursera
- Codecademy – Learn SQL | Codecademy
- Udemy – Java Tutorial for Complete Beginners
- Educative – Learn Java from Scratch – Free AI-Powered Course
- W3Schools – Java Tutorial/SQL Tutorial
Free resources are available from the list above.