Best JavaScript Library and Why?

Question

i am proceeding further in javascript used to be PHP Developer. i want to know some good library's to follow.

Answer 1

why do you have an answer as a tag? I'd say JQuery

Answer 2

there are many js library for many reasons. jquery is kind of must for practical design abilities but if you plan to make apps and backend you need some frameworks and also plugins

just search https://www.javascripting.com to see the popular ones