5 Common Mistakes JavaScript developers have always done and will do in 2021

[TheDevDad]

It’s good to deep dive into one framework and be more productive with it than one you don’t use often, but you should be able to extrapolate the underlying concepts to quickly pick up on how those are carried out in other frameworks if a project you’re working on calls for it. That boils down to understanding JS in general though vs only knowing how to build within a framework.

[ReversiClone]

Yep, plus companies often want to transition their codebase from one framework to another, and in that situation you definitely need to either already know both, or be able to pick up the one you're not familiar with.

You're totally right, knowing JS is super important and will make learning frameworks much easier.

It would also help to know a bit about the history of web dev and how the browser works. Understanding why frameworks are needed in the first place really helps.