Hello,
I have a rocky linux server in which, I have a wordpress site. I am trying with the certbot command that create a certificate. It tells me that it is created successfully but when I launch my site, I have an error page.
We need more information before being able to help. Are you running on apache or nginx? Have you definitely set your *.conf file to point to the certs? Have you restarted your web server. Is the error something like the site is not secure or something else.
If you’re relatively new, it is sometimes hard to know what information to give when stating a problem. If certbot successfully installed the certs, I’m assuming from letsencrypt, they should be /etc/letsencrypt/live/ and your conf file should be pointing to privkey.pem and fullchjain.pem