Install unattended-upgrades for daily security upgrades
Windows 8/10 Icons/Tiles/etc. http://www.buildmypinnedsite.com/
Also – browserconfig.xml –
<meta name="msapplication-config" content="/browserconfig.xml" />
is better than adding the data in <head></head> as it’ll only get pulled down by those browsers who need it.
Logs: Goaccess.io is very good for both terminal and HTML viewing.
Validating you RSS feed:
Testing your site from multiple locations: