What are lawn seats at a concert like?

So I think im going to the train/maroon 5 concert at a pretty big
theatre where we are probably going to get lawn seats. I have a few
questions

1. can you see anything from the lawn?
2. is it really crowded and claustrophobic?
3. Does everyone stand and jump around and push or can you sit down?
4. If yes to number 3 are there actual seats/chairs or sit on the
floor?
5. If yes to number 3 but no to number 4 can you bring your own fold
up chairs.

As you can see I dont do this often - only been to small concerts with
no lawn option so yeah please help.

BQ- are those bands good live?