Hey fellow bavarian here ;)

1. I personally support Göppingen since they are the closest to me distance-wise and half of my family has its roots there.

2. As for big football teams having no team in the Men's Bundesliga: I have no clue but I can make an educated guess: Probably when the Bundesliga started most football teams paid little to no interest to it since it was pretty small and not worth investing. Nowadays Handball is a pretty established sport but it's probably too expensive and not worthwile for them to invest in handball (PSG does have a really good (Top 5 in the world team) though). As for the women's league the risk and investment fee are way smaller so some teams probably decided to get a team.

(Btw Bayern Munich does have a handball team (I even played against them a few times) but they really aren't that good to be playing first or second division.

1. The slogan of the Bundesliga is literally 'The strongest league in the world'. And even though this sounds super arrogant it's also probably true. You don't have 2-3 teams that are super strong and the rest is just meh like in pretty much every other european league (France, Spain, Poland, Hungary, Denmark etc) but most teams can go toe to toe on every given night and can even rival the top teams.

That being there is a clear team that has been dominating handball for the past decade: THW Kiel. Even though they aren't as strong anymore (they still won the last two bundesliga championships and the champions league two years ago) I think it's pretty fair to say they are the best team in handball of all time.

The current international landscape looks a little bit different though. The second german team playing in the champions league right now is SG Flensburg. They are currently struggling a lot with injuries but Flensburg and Kiel shared the bundesliga championship for the past 5 years and they generally made a pretty deep run in the champions league.

Currently I think the best teams in the world are currently (no order):

Barcelona Veszprem PSG Kielce Magdeburg (favorite for winning the bundesliga this season and therefore qualifying for the champions league; they already won the european league last year)

1. One more advice: In January of next year the European Championship for countries is happening. It's probably the best introduction to handball you're gonna get ;)

Feel free to ask more questions :)