How to catch up on Dragon Ball Super?
Other than just flat out watching it there are two major routes. 

A) Just read the manga, it's kind of close and gives a good summary in broader strokes, 

B) Watch the movies battle of the gods and return of freeza then you've just got the zamasu arc and the current arc to watch :-) 

For the record questions like this don't really belong here. Since it's so heavily opinionated, and can have no factful approach. 

Conversations like that are better on forums like my anime list or other places.