TorTaughtThe condensed flow: install Tor Browser from torproject.org, copy a v3 mirror from the verified box on the homepage, set the security slider to Safest, paste, verify the PGP timestamp, log in. End to end is under three minutes for a return visitor.
If any of those steps is unfamiliar, the homepage walks through each in detail with terminal output samples. The single non-negotiable habit is the signature check: pull the timestamp block from the login footer, run gpg --verify against fingerprint 0x7F2A0A9D, proceed only on Good signature.
Verified working Nexus Market mirrors
Three v3 onion addresses currently serving the production market, signed under PGP fingerprint 0x7F2A0A9D. Use the Copy button; never retype an address.
Recommended
http://nexuspokkxp4ayqqec3c3lkekwhnjdqur5bqiocemx4t6sy3werqihad.onion
Backup
http://nexusncagw2vnag3ycv62occuouhfgkp6htx7alhnzl5xwgtzi2mfbid.onion
Failover
http://nexusr4ivg23525pvw53h3av7b7xcamxqguprosazaoray33qgrar2qd.onion