Go read open source libraries. I started out barely knowing anything in Javascript and I had terrible code, as almost any dev could say. However, I was never afraid to follow the debugger through the code of the libraries I used. At the time these were things like Backbone and Marionette, which have incredibly clean and well documented code.

Find a library you use and have a feel for how it works, and read through their code. If you run into questions about why something is done a certain way, they'll tell you! Use git blame and see what the commit message was for those lines! Often there will be a description or issue tied to it and you can figure out the thought process they used. Then just start applying similar thinking to problems you encounter.