Certbot

Install certbot

sudo apt update
sudo apt install certbot -y

Get SSL for first time - dns challange

sudo certbot certonly --manual --preferred-challenges dns -d example.com -d www.example.com

Get SSL for first time - dns challange Wildcard

sudo certbot certonly --manual --preferred-challenges dns -d example.com -d '*.example.com'

sudo certbot certonly --manual --preferred-challenges dns -d example.com

sudo certbot renew --cert-name example.com --manual --preferred-challenges dns

List of certificates

sudo certbot certificates