A really simple question

[Jeff]

I was reading this interview with satch, but this comes up a lot.

Part of the interview said "Its hard to play those minor 11th appregios"...there was a lot more to it, but that's the part I'm focusing on. What do they mean "minor 11th?" What sort of a chord shape is that?

Like when you hear people say "I play a lot of 5ths and 3rds" what does that mean?

Thanks