Is Jquery needed if you know React? if not why is it still a part of the fCC curriculum?
It’s a different library with a different purpose. FCC covers a series of different libraries, not just React.
React uses fiber or virtual dom (depending on the version ) which is way more performant than jquery’s way of direct dom manipulation.
I will add some links for you to check out in order to make sense of what I said above.
Virtual dom: https://reactjs.org/docs/faq-internals.html
In my professional life, I have removed/refactored jquery code out of React from 4-5 years old apps.
Hope this helps.