No worries, lots of new users nowadays. It looks like your home instance is lemmy.fmhy.ml, so you can search for relevant communities here: https://lemmy.fmhy.ml/search (that's where the magnifying glass in the top right sends you, assuming you're on a desktop browser).

If I set the search criteria to "communities" and search for "pic" I get these results: https://lemmy.fmhy.ml/search?q=pic&type=Communities&listingType=All&page=1&sort=TopAll

That shows you communities that your home instance is already connected to. Out of those, I'd say pics@lemmy.world would be a good place to post this, you can subscribe to it here: https://lemmy.fmhy.ml/c/pics@lemmy.world

Nice pic, BTW!

That picture could as well have been from Aarhus in Denmark - looks pretty much exactly the same. Good picture btw :)

Why is there so much water 🤨. It's like Venice.

Moin moin! Hamburg is a lovely city, I enjoyed it a lot when I visited a couple of years ago :)