Gaming

I am not sure if it will help you know more people, but Deep Rock Galactic has one of the most friendly Multiplayer experiences I ever had. You will find a lemon from time to time, but in general it is a great community as long as you Rock and Stone when someone Rock and Stones to you (you will understand) :-)

For me this is Minecraft. Finding a casual server with a minimum age requirement was key. I'm surprised how many decade-long friendships came from this community.

You should avoid battle royals and first person shooters. MMORPGs have created communities since their inceptions, I believe. I think FFXIV would fit your description.

Warframe had a very pay-it-forward culture when I played (Fortuna-Old Blood expansions). I got advice on meta starter weapons (Hek/Atomos) and Warframes (Rhino) and where to farm them. I got taxis to locked (for me) planets and direct help for some of the bosses. Other noobs were also helpful for the mutual revives. I even got some free trash mods from a clan member when they saw I was new.

For spontaneous conversations I'd join clan parties or simple missions with lots of downtime (i.e., escort, wave survival). Endgame farms with specific roles and/or time gating like Eidolon hunts were very sweaty.

I got to know a friend of mine in (relaunched) WoW Classic.

Smash bros in general is the biggest one I can think of, but minecraft too.