This could be websites to look up guides, places to buy quality products, or what to buy to get started. All being related to your hobby.
Pornhub. Don’t ask me about my hobbies.
PH is by far the worst porn site
Oscar winning story writing?
Hackaday has been a great place as a starting point for a wide variety of hobbies. And for seeing what fun things people put together
Lichess.org is a great place to play chess, or to study it. Free, open source, run by a great team. Highly recommend.
Garage Journal for people who love tools and anything mechanical.
Lemmy seems to be a good place to start. ;)
I usually use ddg to search for sites, lurk there for a while to see what the questions and answers are and after a while either ask a question myself, when I like the site and haven’t seen the questlon with appropiate answer in search results. That is, when I’m not member of a RL club and they have meetings/a site I can find the answer.