1. Use only Tor Browser or Tails. Never access Tor-related accounts from a regular browser. Tor Browser is specifically configured to resist fingerprinting - other browsers leak unique identifiers through canvas, WebGL, fonts, and screen resolution.
2. Never maximize Tor Browser. Maximizing the window reveals your screen resolution, which is a fingerprinting vector. Keep Tor Browser at its default size. Tails avoids this by using a standardized screen resolution.
3. Do not install browser extensions. Every extension changes your browser fingerprint and potentially introduces vulnerabilities. Tor Browser comes with uBlock Origin - do not add anything else. Extensions like password managers, ad blockers, or privacy tools make your browser unique among Tor users.
4. Use VPN + Tor for defense in depth. A VPN before Tor prevents your ISP from knowing you use Tor. Connect to a VPN first, then launch Tor Browser. This is especially important in countries where Tor usage itself is monitored or restricted.