Synology NAS - SSL with Let's Encrypt Wildcard Certificates

If you don't have a NAS, Cloudflare is convenient and excellent in many ways.

If you do have a NAS, you can easily apply free wildcard certificates using Let's Encrypt.

You can pull Cloudflare from DNS and use it with your NAS, but it's extremely tedious and complex.

Even with just the configuration, you can't apply reverse proxy settings due to security issues.

After configuring the reverse proxy, you need to link the subdomain to the certificate through the certificate settings.