Not quite groking negative vs positive rules in Membership plugin

I did read the documentation and I’m a little confused still. Hoping someone can just give a quick answer to this.

If I only add positive rules – that is a user has access to this or that content, then everything else is negative by default?

If I only add negative rules, is everything else positive by default?

If I add a positive category rule, do have also have to do positive menu rules? What isn’t covered by category?

Is there a way to just move the whole parent level of permissions instead of moving each sub component if I want to give certain users uber access??

I’m just not clear on how to organize this. So far I’m really happy with the ease of use and breadth of protection, just confused on how to implement these permissions.

thanks so much,