Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
And, after many corrections, here is the output of "certbot certonly -d www.ts-info.org":
Saving debug log to /var/log/letsencrypt/letsencrypt.log
How would you like to authenticate with the ACME CA?
1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.ts-info.org
Input the webroot for www.ts-info.org: (Enter 'c' to cancel): /var/www/moodle
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. www.ts-info.org (http-01): urn:ietf:params:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching https://www.ts-info.org.well-known/acme-challenge/8VXAOIjGGiLXCyaBRHsqTxjXq6VdvnB_eRoTf9MF2BM: Invalid host in redirect target "www.ts-info.org.well-known". Check webserver config for missing '/' in redirect target.
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you're using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.