What should be remembered in js?

Question

JavaScript

Hello, friends!
At the moment I am learning js from the textbook by Ilya Kantor. And a question arose during the training.
Right now I’m going through the data structure section, and there are a lot of methods and nuances with working with numbers, strings, objects, arrays .. Tell me, how important is it to remember them by heart? The question arose due to the fact that you seem to be rewriting all the examples, delving into the theory, trying to solve problems
. Should I learn all this or not?

Answer 1

It is not necessary to memorize all these methods at once. With practice, everything will be remembered by itself. At the initial stage, the main thing is to know about the existence of these methods and to know where to look for them when needed.

Answer 2

It is useless to learn JS (like any other JS or technology), possession comes only with practice and experience
From the fact that you read something about a technology unfamiliar to you, you will get a zero result
From the fact that you copied examples - similarly
From the fact that solved independent tasks - the result is about 5% Start doing a small project and crawl
into MDN for information, it will be much more efficient