Those one-liners that:
you've learned not to underrestimate
all the time it took to put them together
don't know where to keep
How to generate a certbot certificate valid for a domain and multiple subdomains.
certbot-auto certonly --expand --non-interactive --agree-tos \ --keep-until-expiring --standalone \ --domains \ mydomain.com,sub1.mydomain.com,sub2.mydomain.com,sub3.mydomain.com