Should I use Flexbox or CSS Grid? What is each used for?

Answer 1

To boil this question down to its simplest answer, Flexbox works either in vertical or horizontal orientation, while Grid allows for both vertical and horizontal dimensions simultaneously. Therefore, there is no clear answer on which should be used over the other. It comes down to what you are trying to accomplish on screen and which layout system accommodates those needs best. Both layout systems offer rich cross browser support, so it's well worth your time to learn the strengths and weaknesses of both systems.