I have been reading a bit about the deep web and the dark web, and that you need to connect to the onion network through a VPN to navigate anonymously.
I'm currently using Tails and its default system: onion circuits. I have read that onion circuits is just a free VPN, is this correct?
I have read as well that, to check if you are navigating anonymously, you need to go to some what-is-my-ip web and verify that it can't determine your IP or that it matches with the VPN's one. Is this correct? I don't understand very well what is the VPN's IP, could you give more details about it?
EDIT
Of course I'm using the Tor browser, it comes with Tails by default.