Choice of VPN

Hello,

RB4011iGS+RM owner here. I’m hoping for a bit of guidance for VPN.

I recently upgraded my lan server (the old one only served as a NAS and Jellyfin for the internal network) and now I would like to do Immich and Jellyfin for our mobile devices when outside the home.
I would also like to be able to do some steamservers with a couple of friends, without exposing all of my lan to them.

Are there any good guides (no reason the reinvent the wheel) to point to?

For instance I don’t know if L2TP or OpenVPN can do I what I want?

Look at zerotier to share gaming server…