Ok, that's a bit drastic, but it's basically true when you're starting jiu-jitsu. As far as learning goes, try to speak as little as possible about technique and listen to every single thing your instructor says and watch every tiny detail of their movement.
The biggest issue around talking a lot is people who ask "what if" questions. It's understandable to want to know as much as possible straight away but it's impossible, you can't learn every variation of every option in every position straight away. If you don't understand something, or can't do a movement properly, ask your instructor... but if you immediately want to know every "but what if they do this?" then you'll slow down your learning. Trust your instructor (well, pick a good one then trust them!) to teach you well.
Much rarer, but I've also encountered people who have to talk a lot to act like they understand more than they do... and it never works anyway. Don't try to impress instructors by explaining how well you understand something just listen to what everyone more experienced says and remember it all.
As you get more experienced you'll learn to be able to ask better questions :)