React

Question 1

Functions that start with use are

Answer 1

Hooks!

Question 2

You can write your own hooks

Answer 2

By combining the existing ones

Question 3

Custom hooks

Answer 3

Allow for sharing the same internal logic between components, though their displays may be different.

Question 4

Refs

Answer 4

Are references to Dom nodes

Question 5

Forward refs

Answer 5

Allow a child to expose a reference to a Dom node back to a parent. That can then be used to pass to other children so they can reference the Dom node as well.