[auslegung]

React seems to be the most popular framework right now, so Mongo Express React Node (MERN) would be a great thing to study. I think you're not going to go wrong no matter what you study because you're 14 years old and asking this question. Many people 10 or 20 years older than you aren't asking these kinds of questions.

And since you're obviously not the average person, you should check out https://elm-lang.org. It's a purely functional language and it will improve the way you write code in any language.

[oppressedgf]

Damn, Elm looks really interesting, I'll be sure to give that a go - the fact it generates to pure JavaScript too seems cool, thanks

[auslegung]

You should also check out https://www.cscareerhackers.org. It's a discord server and is an enormous community committed to lifelong learning, career help, etc.