Learning to code

There are lots of free resources available to start learning coding online.
Here are some to get you started.

Learning to code:
1. W3Schools
2. FreeCodeCamp
Taking it further:
3. JavaTpoint
4. GeeksforGeeks
5. DEV Community
Testing your knowledge:
6. LeetCode
7. HackerRank
8. LinkedIn
Asking for help:
9. StackOverflow
Extra:
10. Udemy

Learning to code:

1. W3Schools

Reference website to learn about web technologies online. Learn about HTML, CSS, JavaScript, Python, SQL and much more. It also has a built in editor so you can play around with code without leaving the site.

2. FreeCodeCamp

An interactive web development learning platform. Learn about HTML5, CSS, JavaScript, Python, Algorithms, Data Structures, Node, jQuery, React, Python and much more. Also gives you a certification after completing a course.

Taking it further:

3. JavaTpoint

Read up on subjects like digital marketing, functional programming, AI, testing and much more.

4. GeeksforGeeks

Well explained articles related to computer science and programming.

5. DEV Community

This site. =)

Test your knowledge:

6. LeetCode

Try programming puzzles and get scored on runtime and memory usage.

7. HackerRank

Programming puzzles with certifications for topics like CSS, JavaScript, Problem Solving and much more.

8. Linkedin

LinkedIn is not only for looking for a new job, but also has a section where you can test your skills in several categories like Front End Development.

Need help:

9. StackOverflow

Question and answer website for programmers. When you get stuck, this is the next step after Googling.

Extra:

10. Udemy

The only paid alternative in the list, Udemy is a course provider with videos on most topics. Some courses can be expensive, but most of them are available for a recurring discount of around €12.

Hopefully some of these will be of use to you.