Learn to code is the best thing you can do online. The coding is not limited and You will explore what You can do with a few lines of code. It always feels amazing to learn something new for a better web.
Before sharing the resources, It is important to keep the golden rule(2) in mind of documenting what we learn. It is recommended to use Firefox as a Browser which offers amazing features for developers.
Practice is Important, You can start with a Code Playgrounds like Codepen or JSfiddle. But it is recommended to create small projects.