How to install TLS certificate on Raspberry Pi 4 by using ZeroSSL?
This article shows how to setup HTTPS server by apache2 on Raspberry Pi, which certificate is issued by ZeroSSL who is rival of Let's Encrypt!
It is very easy to create certificate because almost all operation can be done by GUI!
Here you can see many images for each configuration screen, so you can do it!
2020.12.07
HTTPSRaspberry PiZeroSSL