Switched to an SSL certificate and broke a WordPress site, what should I do and how not to lose information in the form of articles?

Question

Digital certificates

I switched to an SSL certificate and broke a WordPress site, what should I do and how not to lose INFORMATION in the form of articles?
I successfully switched to Comodo SSL certificate:

BUT only when I try to access the site, they write me this:



Please help me with advice, I really don’t want to be left without my site for the New Year =(

Answer 1

Set DNS for www.
Your site is unavailable via www due to DNS, and in the WP config there is a domain with www. The wp_options table in the database. Therefore, the browser will redirect to www.