Suppose if I need ECDSA cert do I use this command? certbot certonly --key-type=ecdsa --elliptic-curve=secp256r1
How would you like to authenticate with the ACME CA?
1: Obtain certificates using an integrated DNS server (dns-standalone)
2: Spin up a temporary webserver (standalone)
3: Place files in webroot directory (webroot)
After setting --key-type=ecdsa on the command line, you can obtain your certificate just like you would normally. There's more documentation about obtaining ECDSA certificates with Certbot at https://certbot.eff.org/docs/using.html#using-ecdsa-keys.