Person I'm dating was upgrading to a Switch 2 and I was amenable to buying their used Switch 1 off of them.

So, now I have a Switch 1. I don't really know what to do on it. I'm not familiar with the Switch 1 game catalogue, yet. I haven't been keeping tabs on Nintendo since the Gamecube days. I had a similar experience with buying a Wii after it was old news and that was cool until they stopped supporting online features for the device (so I couldn't download any more retro-catalogue games).

So, I guess I'm hoping to finally get all the retro games I like on the Switch 1 via its online features. Also, hoping to grab a few banger games for guests to play whenever they are visiting me. I also have several friends with Switches at this point so I guess online multiplayer might be of interest.

So, what I'd like to know:

1. Should I be concerned about online support for the Switch 1 suddenly vanishing like it did with the Wii in the near future?
2. What are your game recommendations for single player?
3. What are your game recommendations for in-person multiplayer?
4. Any particularly great multiplayer titles where you can play online with people you know?