How Does Multiplayer Work?

Steam sale ends tomorrow morning and I'm so close to pulling the trigger on this. I understand the campaign is unfinished, and there are some things that could be improved, but I'mn thinking this could be a decent game to spend a lot of time in.

I'm not exactly 100% sure how character builds work, it seems more complicated than Diablo II, but less complex than PoE. I have noticed a respec button, so I hope it isn't too painful to "fix" mistakes. Diablo II and Torchlight II are probably my gold standard for ARPG character builds if I'm honest.

That's not why I'm here though. I can't really seem to get an idea of how multiplayer works. I see that there is a global chat. Is there an in-game LFG? How hard is it to find others to play with?

I'm not expecting anything too elaborate or complicated, but it's nice to just chill with others and play ARPGs, Project Diablo II has a pretty active multiplayer. in PoE I found people just using it for trade.