Frameworks are there to solve a problem, but how to pick a framework unless you actually know the problem?
Knowing the problem comes when you try to write something of your own, which can only happen if you forget about all this Framework jargon and focus on vanilla JS.
OT: All this framework questions makes me wanna cringe. Guys, basics of programming is the core principle behind everything, learn that first. No amount of framework will make you a better engineer. Phew, sorry for the rant.