Tor
What is Tor
An open source project: https://www.torproject.org/download/tor/ Surf the Net anonymously.
The Onion Router
How it work
Hop 3 or more nodes before actually visit target server. The target server only reveal in the latest node. Like onion.
How to use it
Never login to user-profiled website, ex: Facebook Google ... Never login same account in non-tor mode. Only HTTPS No BT Keep Latest version of tor browser.
Reference
https://hacyber.com/what-is-tor/https://tails.net