Download Tor Browser
Go to torproject.org — not a mirror site, not a torrent, not a search result. The official page only. Download the package for your OS: .exe for Windows, .dmg for Mac, .tar.xz for Linux.
Before you open anything, verify the GPG signature. The Tor Project's signing key is
0x4E2C6E8793298290.
On Linux:
gpg --verify tor-browser-linux64-14.x.tar.xz.asc # Expected: Good signature from "Tor Browser Developers..."
No GPG available? The download page has SHA256 hashes. Match them with your system's built-in hash tool before installing. This eliminates the most common attack vector: a malicious browser build served by a compromised mirror.
Alternative: Tails OS. A live operating system that boots from USB with Tor Browser pre-configured and no persistent storage. If you use a shared computer, Tails eliminates most operational risks before you even connect. Shut down Tails and nothing remains on the host machine.