The freecode one will start you off with HTML and CSS but can skip that and move to the JS if you like, it more an intro. Really in coding I think if you don't understand what something is doing maybe try simplify it, usually you should be able to read it like english. Don't try be smart because tomorrow you look at your own code and think wtf did you do. lol.
A big thing for me is knowing how things connect, what their role is, so if want can always give you a voice rundown on how I see some things. Also codingame is a great site for playing just with simple commands in a almost game like manner. https://www.codingame.com/