The important parent folder is “BraveSoftware”. Often, I back up that folder, first, by .zip compression, and second, saving that resulting .zip file on an external drive - so it can be found “when all else fails!”
On your Mac:
/Users/user_shortname/Library/Application Support/BraveSoftware/
Wandering around in the sub-folders:
/Users/user_shortname/Library/Application Support/BraveSoftware/Brave-Browser/Default/Bookmarks
On your Windows OS PC:
C:\Users[username]\AppData\Local\BraveSoftware\
Wandering around in the sub-folders:
C:\Users[username]\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default\Bookmarks
C:\Users[username]\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default\Bookmarks.bak
The bookmarks files that you are looking for, are those “Bookmarks”.
Re Passwords: