1. Code tutorial websites teach mostly syntax but are weaker when it comes to teaching you how to set up an environment and structure a new environment. As such, it's useful to look at other people's code on github or similar. Websites and web applications are only partially about the code your write; they are also about the system on which they are built. Learn what it means to "deploy" a website and how that works. Even though some will argue that that's more of an operations concern, as a web developer you often have to wear multiple hats, including operations and server management.

2. With languages like javascript, especially for those with no programming experience, it's really easy to get your feet wet and believe that you "get it", that you "know javascript". That's a fallacy. Javascript, perhaps more than other languages I know, is easy to stitch together to get working (quick and dirty) but really tricky to write eloquently in a way that follows core software development principles and in a way that is easy to manage in the long term (which is part of the reason that there are so many JS frameworks out there).

3. Accept that there are things that you just don't know (and things that you don't know you don't know) and dedicate time to learning from others; not just as you get started, but forever. We spend time on our team every day sharing even the smallest things that we've learned that week to promote this idea (even things like "I discovered the `git add -p` command and here's what it does!").