In normal Tor usage, you just visit ordinary web pages. The Tor network hides the user from the server, but it still requires the server to have a known DNS name and IP address to be reachable. Hidden services (which are not a built-in idea, they are an ugly hack and not super secure) let both sides act like a user and connect through a publicly-known intermediary. https://www.torproject.org/docs/hidden-services.html.en
I think the only problem called out here is having Google Analytics scripts running on the page, which try to fingerprint the user's browser even when you're trying to search anonymously.
OK so if I want to search for a newer equivalent of Silk Road, how do I go about it?
Thats stuff isn't going to show up in Google searches is it?
It does, you will find a few websites talking about it and you will have to choose to trust the URL they give you.
It's kind of like real life though, how did you get the URL of your bank? You either trust Google.com to give you the right one because you trust them as a search engine, or you pay a visit to your bank and ask them.
Edit: I see I have been down voted. It was a genuine question.