Some of this is still being rolled out. Brave is still in beta, meaning it’s actively being developed for official release. Right now, it’s good enough to be used day to day for many of us, but there are still features being worked on.
Eventually, you can sign up to look at advertising curated by Brave that will not track you or collect your information to specifically target you. If you do so, you’ll receive money as the Basic Attention Tokens (BATs) they talked about. You can also add money to your wallet. You may eventually be able to take money out as well, but I’m not positive on that. I’m just a forum user.
As you browse, you can select that sites you frequent be paid back in BAT, with a percentage going towards the pages you regularly view. So if you spend 30% of your time on, say Twitch and 70% on, I don’t know, Youtube, they’ll be paid that percentage.
All of it is optional. You can still use Brave and block all of the ads or you can use it and allow ads.