First of all, there is lewd.sx (toots own horn)
If you're into fanfiction, there are several sites that are good.
Spacebattles, The Dark Lord Potter forums, Sufficient Velocity, fanfiction.net, archive of our own, questionable questing, and fiction.live
Anime tracking websites:
anilist, myanimelist, kitsu, anime-planet
Writing tools:
hemingway, write with transformer (ai), cliche finder
for information about music genres, i highly recommend Every Noise at Once
there are various web games such as pokerogue, pokemon showdown, flashflashrevolution, and more.
People are also doing some cool stuff on neocities (replacement for the defunct geocities).
