I can’t open the link right now cause it seems to have gotten the hug of death, but if they didn’t mention it check out Caddy. It handles the certificates all automatically. All you have to do is set up the DNS record and then point Caddy at your internal service and it handles the rest.
Just FYI Oracle has language that reserves the right to shut down free tier machines that they deem “idle”.
https://docs.oracle.com/en-us/iaas/Content/FreeTier/freetier_topic-Always_Free_Resources.htm
HiDPI scaling has been completely broken in Linux ever since the UI update and for some reason Valve is slow in fixing it.