I don’t hear many developers talk about #4 here.
But, it’s so critical.
If you start your web development career by picking a language, you’re making it much harder on yourself. And, that’s what #4 in this video addresses:
In any case, if you wanna know how to methodically become a full stack web developer, give it a watch. It’s my recommended path to make a lot fewer mis-steps and get there faster.