That worked perfectly. Thanks for sticking with me on this! But I made the changes in another domain, and it’s (a) not redirecting from http and (b) displaying a warning from https. Here’s its file:

That worked perfectly. Thanks for sticking with me on this! But I made the changes in another domain, and it’s (a) not redirecting from http and (b) displaying a warning from https. Here’s its file:

It looks like it is set correctly:
curl -Iki http://computingunplugged.com/x/y/z
HTTP/1.1 301 Moved Permanently
Date: Sun, 17 May 2020 03:05:14 GMT
Server: Apache/2.4.18 (Ubuntu)
Location: https://computingunplugged.com/x/y/z
Content-Type: text/html; charset=iso-8859-1
Perhaps your browser has cached that a previous page.
Try clearing your cache or using a different browser.
And since things have changed, please show the current:
certbot certificates
apachectl -S