How to deal with www and non-www domain names with one certificate?

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I don't understand how to deal with forcing all connections to www.sierraprogress.org to simply sierraprogress.org , forcing all connections to my website with https , and using only one certificate per domain name?

Here's my unique server information:
CentOS 7
Server version: Apache/2.4.41 (codeit)
OpenSSL 1.1.1c

1.) Forcing all connections to www.domainname.com to domainname.comis best done with a rewrite rule, isn't it? I've found some examples online, but I don't know if one is better than the others?

RewriteEngine On
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [L,NE,R=301]

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^([^.]+)\.sierraprogress\.org$ [NC]
RewriteRule ^(.*)$ https://sierraprogress.org/$1 [R=301,L]

RewriteEngine On
RewriteCond %{HTTP_HOST} ^sierraprogress\.org$ [NC]
RewriteRule ^ https://www. sierraprogress.org %{REQUEST_URI} [R=301,L]

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www.sierraprogress.org
RewriteRule (.*) https:// sierraprogress.org /$1 [R=301,L]

Since I want ALL websites that this server will host to remove the www AND be https connections, maybe the first example is best?

Do I just place this code snippet in my httpd.conf file?

2.) Here's my sierraprogress.org.conf file:

<VirtualHost *:80>
    ServerName sierraprogress.org
    ServerAlias www.sierraprogress.org
DocumentRoot /var/www/sierraprogress.org/public_html
<Directory /var/www/sierraprogress.org/public_html>
        Options -Indexes +FollowSymLinks
        AllowOverride All
    </Directory>
    ErrorLog /var/www/sierraprogress.org/error.log
    CustomLog /var/www/sierraprogress.org/requests.log combined
</VirtualHost>

<VirtualHost *:443>
    DocumentRoot /var/www/sierraprogress.org/public_html
    Protocols h2 h2c http/1.1
    ServerName sierraprogress.org
    ServerAlias www.sierraprogress.org
<Directory /var/www/sierraprogress.org/public_html>
        Options -Indexes +FollowSymLinks
        AllowOverride All
    </Directory>
ErrorLog /var/www/sierraprogress.org/error.log
    CustomLog /var/www/sierraprogress.org/requests.log combined
    SSLEngine on
SSLCertificateFile /etc/httpd/ssl/sierraprogress.crt
    SSLCertificateKeyFile /etc/httpd/ssl/sierraprogress.key
SSLCipherSuite HIGH:!aNULL:!MD5
</VirtualHost>

The one certificate I'm using ( sierraprogress.crt) works fine for sierraprogress.org connections but, of course, will NOT work for www.sierraprogress.org connections because of the domain name mis-match. I've also tried using a wildcard certificate for *.sierraprogress.org (see below), but I couldn't get that to work at all.

Suggestions on how to handle these issues?

Thank you for your time and suggestions!
Ed

Certificate Decoder - https://www.sslshopper.com/certificate-decoder.html

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-----END CERTIFICATE-----
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-----END CERTIFICATE-----

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