It can be overwhelming since it doesn't really try to rate them or give a feature comparison, but there is also
@Santhosh-3, if you want an experience similar to a paid CA (only without having to pay for the certificate), you might also try https://www.zerossl.com/, but using a client application on your server can ultimately be more convenient, because Let's Encrypt certificates expire every three months and have to be reissued at least that often. Client applications like Certbot and others can help automate this process so that you won't have to have a human being actively do anything for the periodic certificate renewal.