Add (or modify) an FAQ section with common questions / pitfalls

[johnrom]

📖 Documentation

We should add a FAQ to the official docs, so we can point commonly asked questions there with code examples demonstrating common pitfalls users fall into. React's is here: https://reactjs.org/docs/faq-ajax.html

Effects

A lot of people ask around here how to perform actions when any field changes, save state to a higher component, log errors on submit, etc. I think it'd be nice to have an area of documentation we can point to and make it official.

#1745
#1633
#271
#1750
#172
#1106
#1670

Input lag / many renders

This is almost always "a function re-creates a component on every render which React cannot identify as the same component."

Feel free to add other Q's here if you find them asked multiple times in issues or the discord.