About: Im 14 im learning html and css and im going to go on from that.
Also take a project and try to develop it...
Maybe, start with the back end of it (nodejs) so you'll learn Javascript without html, css, and browser components that can complicarte your learning.
Why not just try a blog engine?
I recommend this material, it was a precious resource back to the days when I was struggling to learn the language: github.com/getify/You-Dont-Know-JS
It seems that there is a newer version. I haven't read it but definitely it worths a shot.
I suggest watchandcode.com, there is a free practical JS course where you work on a to-do app.
Also the Udemy Javascript: Understanding the weird parts. Its not free (you should wait for a sale) but it is very helpful in understanding a lot of JS
I recommend going to freecodecamp.org/ and going through their tutorials - they are free and pretty great!