Was going to say exactly the same thing.

Even if your router have one, better safe than sorry!

Take a look at certbot. You don’t need to pay for ssl and ssl is actually pretty mandatory for anything served on the internet.

Make sure you don’t forward too much ports. And make sure you have a working firewall that only allow those same ports. You should be good to go then.

You should take a look at https://www.youtube.com/channel/UCp3yVOm6A55nx65STpm3tXQ he does have a serie about doing something like this and go in depth in it

Thank you !

Can you link the wallpaper ? :-)