Certbot

List all certificates:

sudo certbot certificates
Create wildcard certificate for domain example.com:

 sudo certbot certonly --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory --manual-public-ip-logging-ok -d '*.example.com' -d <example.com>
Delete certificate:
 sudo certbot delete
Get certificate with HTTP challenge,
From root folder .well-known/acme-challenge/[Some randome filename from lets encrypt] 
 certbot certonly --manual --preferred-challenges http --email youremail@mail.com -d example.com -d example.org

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