Apache Virtual Hosts on Debian 10

#cd /var/www
#mkdir -p /var/www/mydomainname.com
#chmod -R 755 /var/www/mydomainname.com
#chown -R www-data:www-data /var/www/mydomainname.com
#mkdir -p /var/log/apache2/mydomainname.com
#cd /etc/apache2/sites-available/
#cp 000-default.conf mydomainname.com.conf

#vim mydomainname.com.conf

Insert code below

<VirtualHost *:80>

ServerAdmin webmaster@localhost
ServerName mydomainname.com
ServerAlias www.mydomainname.com mydomainname.com

DocumentRoot /var/www/mydomainname.com
<Directory /var/www/mydomainname.com>
Options Indexes FollowSymLinks MultiViews
AllowOverride all
Order allow,deny
allow from all
</Directory>

ErrorLog ${APACHE_LOG_DIR}/mydomainname.com/error.log
CustomLog ${APACHE_LOG_DIR}/mydomainname.com/access.log combined

</VirtualHost>

Activate

#a2ensite mydomainname.com.conf
Enabling site mydomainname.com.
To activate the new configuration, you need to run:
  systemctl reload apache2
# systemctl reload apache2

Check

#ls -la /etc/apache2/sites-enabled/
total 8
drwxr-xr-x 2 root root 4096 May 31 18:35 .
drwxr-xr-x 9 root root 4096 Apr 10 15:07 ..
lrwxrwxrwx 1 root root   35 Apr 10 13:23 000-default.conf -> ../sites-available/000-default.conf
lrwxrwxrwx 1 root root   54 May 31 18:30 mydomainname.com.conf -> /etc/apache2/sites-available/mydomainname.com.conf

To add more virtual hosts for another domain please follow the step above