No, the warning is normal because you use a self-signed certificate. That's totally normal.
If you use DDNS as well you can try this one: How-To: Let's Encrypt on GLDDNS domain
No, the warning is normal because you use a self-signed certificate. That's totally normal.
If you use DDNS as well you can try this one: How-To: Let's Encrypt on GLDDNS domain