Download Tor (recommend Linux):

https://www.torproject.org/download/

"Please do not torrent over Tor. Tor Browser will block browser plugins such as Flash, RealPlayer, QuickTime, and others: they can be manipulated into revealing your IP address.

We do not recommend installing additional add-ons or plugins into Tor Browser

Plugins or addons may bypass Tor or compromise your privacy. Tor Browser already comes with HTTPS-Only mode, NoScript, and other patches to protect your privacy and security."

If you want to hide tor use from isp or you live in place like China use bridges (secret entry relays that make traffic look like something else):

Currently there are three pluggable transports available, but more are being developed.

obfs4 obfs4 makes Tor traffic look random, and also prevents censors from finding bridges by Internet scanning. obfs4 bridges are less likely to be blocked than its predecessors, obfs3 bridges. meek meek transports make it look like you are browsing a major web site instead of using Tor. meek-azure makes it look like you are using a Microsoft web site. Snowflake Snowflake is an improvement upon Flashproxy. It sends your traffic through WebRTC, a peer-to-peer protocol with built-in NAT punching.

To use a pluggable transport, click "Configure Connection" when starting Tor Browser for the first time. Under the "Bridges" section, locate the option "Choose from one of Tor Browser's built-in bridges" and click on "Select a Built-In Bridge" option. From the menu, select whichever pluggable transport you'd like to use.

Once you've selected the pluggable transport, scroll up and click "Connect" to save your settings.

Or, if you have Tor Browser running, click on "Settings" in the hamburger menu (≡) and then on "Connection" in the sidebar. Under the "Bridges" section, locate the option "Choose from one of Tor Browser's built-in bridges" and click on "Select a Built-In Bridge" option. Choose whichever pluggable transport you'd like to use from the menu. Your settings will automatically be saved once you close the tab.

List of dark web websites (including drugs markets like tor2door - screw the war on drugs!):

https://dark.fail/

Also chat over Ricochet Refresh - Ricochet Refresh is an open-source project to allow private and anonymous instant messaging:

https://www.ricochetrefresh.net/

"Ricochet was launched in 2014 as a different approach to instant messaging that doesn’t trust anyone in protecting your privacy.

Ricochet Refresh uses the original Ricochet open-source software but has improved on it substantially, such as upgrading its security and making it compatible with Tor Onion Services v3 instead of the older v2.

We believe software like Ricochet is important to protect freedom of expression for whistleblowers, activists, and journalists worldwide."

"Ricochet Refresh is a peer-to-peer messenger app that uses Tor to connect clients. When you start Ricochet Refresh it creates a Tor hidden service on your computer. The address of this hidden service is your anonymous identity on the Tor network and how others will be able to communicate with you.

"To start a chat with someone you need to add the address of their Ricochet Refresh hidden service to your contacts. When you start a chat with one of your contacts a Tor circuit is created between your machine and the your contact's machine. A Tor circuit consists of a series of hops between your machine, Tor nodes, and your contacts machine. It is this use of multiple nodes that provides anonymity, no single node knows both the origin and destination."