Questions are always welcome.
The number beside name is your reputation. It matters and it also does not matter.
Check this sit out that should answer a lot of your questions.
---> https://hivelibrarian.herokuapp.com/

Check out https://3speak.tv/ for video uploads linking to hive posts.
Each front end is a filter and aggregate of what that community is about. The filters are/can be the focus and tags of that community. Try to keep to what each community focus is when posting.
You can buy hive, earn it, or trade for it.
@scottcbusiness posts and this one specifically should give you a leg up