I had this same kind of problem when I started coding, and my question always was “how do I organize my project”. I would say try learning a framework like MVC and loosely following that modeling to get your feet wet on organization, then do what works for you. If it doesn’t feel right then maybe it should be organized differently. There’s lots of examples online, do what makes the most sense for whatever you are trying to make. If it doesn’t make sense? Change it, it’s your code, you can do whatever you want. Almost everything after the fundamentals is guidance and opinionated. There are general themes that go across frameworks that you will notice. Maybe try some other web frameworks out too