Darknet (Eng. DarkNet, “black Internet”, or “shadow Internet”) is a hidden segment of the Internet, accessible only through specialized browsers. For the safety of network users, the darknet is completely anonymous - an encrypted connection between participants is used to access it.

The "shadow web" has its own resource addresses on the .onion network. These sites are not indexed, so they cannot be found in a standard search engine - their analogues (TorCH, Seeks) are used instead. Also, directories of sites on the dark web (HiddenWiki) are used to search for resources for specific tasks.

As a rule, three types of networks are distinguished - these are the "visible Internet" (regular public sites), the "deep / deep Internet" (resources with private access, usually corporate) and the darknet. As in the case of the darknet, resources in the "deep web" are not indexed, and access to them is limited by a login and password, but no special software is required to get to them.

How to get into the darknet
The easiest and most common way to access the darknet is to download the Tor browser, since it is on its network that most of the shadow resources are located. Tor was developed in the late 90s at the US Naval Research Laboratory for secure communications of intelligence agencies, but then the project became open, and now the Tor Project team is responsible for its development.

Another service to enter the darknet is the I2P network. This segment has significantly fewer resources than the Tor network, but it is more secure and anonymous, since it was originally designed to access hidden sites. However, this project is developing more slowly, since there are much less funds for its development: it was developed and is still supported by a team of enthusiasts.

If you are interested in this area, you should read darknet markets reviews  and I think it will be useful for you. I hope you take my advice