From the post:
While browsing the darknet (Onion websites), it’s quite stunning to see the number of badly configured Hidden Services that will leak directly or indirectly the underlying clearnet IP address. Thus canceling the server anonymity protection that can offer Tor Hidden Services.
Here are a few rules you should consider following before setting up a Onion-only website. This guide covers both Apache and Nginx.
… (emphasis in original)
Presented as rules to preserve .onion anonymity, these five rules also test of your qualifications to run a web hidden service.
If you don’t understand or won’t any of these five rules, don’t run a web hidden service.
You are likely to expose yourself and others.
Just don’t.