I have some questions about guardian angels and guides

By asking these questions I'm in no way challenging peoples beliefs. I've always felt called to work with angels and as a Pagan spirit guides are common, but I need some help understanding.

As a Pagan there's a lot of beings that are worked with from fae to dragons, but angels aren't so much as they're a Christian/Abrahamic concept. So its a little new to me and I'm trying to wrap my mind around it.

-Are guardian angels a type of spirit guide? Or are the two different and how so?
-Do we have both a guardian angel and a spirit guide from birth?
-Why do guardian angels choose to spend their lives assisting one single person?
-Do angels work with non-Christians?
-Why would a higher being such as a guardian angel choose to spend its time dealing with someone as 'boring' as a human being? Considering most of us spend majority of our day doing mundane things like work and errands.
-What happens after a human being passes? Do the angels work with them in their next life (If reincarnation exists)

From my time off and on looking into light work and angel healing I get the feeling that they're most likely individuals, but it's hard for me to understand why a higher being who is an individual with their own likes/dislikes and tastes would happily only focus on a simple person like myself.

Growing up as a Christian I got the impression that a guardian angel existed only to work with and assist one specific person, nothing else. That every moment of their lives was spent focused on that person. So its hard for me as a Pagan who knows that creatures like Fae may work with humans but have their own lives to tend to as well, to comprehend that guardian angels are 1000% on top of what goes on in their humans life and not do anything else for themselves.

This is something I'd really like to understand better as angel healing is an area I'm excited about delving into.

If someone can answer these I'd be so happy and thankful.

Blessings, Larimar.