1. freeCodeCamp

https://www.freecodecamp.org/ Why it’s useful: Offers a comprehensive curriculum covering web development, JavaScript, algorithms, data structures, and more. You can also earn certifications and practice coding through projects.

2. Codecademy

https://www.codecademy.com/ Why it’s useful: Provides interactive coding lessons in various languages like Python, JavaScript, HTML/CSS, and SQL. Offers both free and paid content for different skill levels.

3. Coursera

https://www.coursera.org/ Why it’s useful: Provides courses from top universities and companies on various programming languages, web development, data science, and more. Many courses are free, with paid certifications available.

4. edX

https://www.edx.org/ Why it’s useful: Similar to Coursera, edX offers a wide variety of programming and computer science courses from universities like Harvard and MIT. Offers both free and paid options.

5. Khan Academy

https://www.khanacademy.org/computing Why it’s useful: Offers free coding lessons for beginners, with an interactive environment for learning HTML/CSS, JavaScript, SQL, and more. Focuses on clear explanations and hands-on coding practice.

6. The Odin Project

https://www.theodinproject.com/ Why it’s useful: A full-stack web development curriculum that covers HTML, CSS, JavaScript, Git, Ruby on Rails, Node.js, and more. It’s free and project-based, helping learners build real-world applications.

7. SoloLearn

https://www.sololearn.com/ Why it’s useful: Provides a mobile-friendly way to learn coding on the go, with interactive lessons and challenges. Offers a wide variety of languages, including Python, Java, and C++.

8. Udemy

https://www.udemy.com/ Why it’s useful: Offers thousands of coding courses, often at discounted prices, on topics ranging from web development to machine learning. You can find courses for all levels of expertise.

9. HackerRank

https://www.hackerrank.com/ Why it’s useful: A platform for practicing coding problems and preparing for coding interviews. It covers languages like Python, Java, and SQL, and includes competitive programming challenges.

10. Exercism

https://exercism.io/ Why it’s useful: A platform with free coding exercises across 50+ programming languages. Offers mentoring from experienced developers to help improve your skills.