Preferably for free? Can this be done? I've heard TeamViewer is the easiest way to do it, but that it isn't secure. Also, if another user is logged onto the machine, it's a no-go. Is that how it is ...

A VPN setup is the most secure way to access your home server remotely. Unifi Teleport offers a simple method to connect to your home network. Other options like Wireguard can also provide a ...