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First you've got to determine where threats can come from, then which surfaces are vulnerable and eventually the reach. In short what I mean:
SSH port (default 22) is high on the threat encounter level. Lots of bots try to scan every host they can find for an open SSH port. The risk is high because this is a doorway to your network. There's honestly no good reason to have port 22 open to your home. Get tailscale vpn. There are alternatives, I use tailscale, it's great.
When youre hosting apps, they can also be vulnerable. Keep them updated and you'll mostly be fine. There are levels of security. Super super secure is creating seperate networks for these apps so they can't access others. Bit much imo. Use non-rooted docker, enough of a sandbox.
In the end you're a small fish in a big pond, not saying you should be a cowboy but with a few decent measures you should be OK.
Tl;dr
What's wrong with exposing port 22? I have password authentication disabled, ssh keys only. Isn't that secure enough?