Ok thanks.
Zerossl is free for only 90days. I don't want to pay 10$ per month for zerossl. I would be cheaper any other hosting service that provides more space, a working panel and free ssl certificates.
I'd use instead Let’s Encrypt that is totally free but I have to install it using the Certbot ACME client.
To use Certbot I need to access via SSH to the server where my site is hosted, with the ability to sudo.
I also have to know the software and the system on which my site is running.
Thanks