If you’re a beginner and you’re looking for the most secure way with least amount of effort, just VPN into your home network using something like WireGuard, or use an off the shelf mesh vpn like Tailscale to connect directly to your JF server. You can give access to your VPN to other people to use. Tailscale would be the easiest to do this with, but if you want to go full self-hosted you can do it with WireGuard if you’re willing to put in a little extra leg work.

What I’ve done in the past is run a reverse proxy on a cloud VPS and tunnel that to the JF server. The cloud VPS acts as a reverse proxy and a web application firewall which blocks common exploits, failed connection attempts etc. you can take it one step beyond that if you want people to authenticate BEFORE they reach your server by using an oauth provider and whatever forward Auth your reverse proxy software supports.