The whole path, in the order it happens.
Everything on this site in the sequence you would actually meet it, with honest timings.
Install Tor Browser from the project, verify the signature, set the level to Safest. Fifteen minutes once. Skipping the verification is the most common shortcut and the one that undermines everything after it.
Copy one from the verified list rather than typing it. Wait for the page, because a cold connection legitimately takes tens of seconds. At the login screen, compare the printed onion against your address bar, reading from the end backwards. Only then continue.
A username used nowhere else, a long generated password from a local manager, the recovery phrase written on paper, two factor enabled immediately. Ten minutes, and a leaked password from an unrelated site stops being the end of the account.
Decide at this point rather than at the payment screen. If the purchase should leave no permanent public record, that is Monero. If you accept a record, the other two differ on speed and fees. Move the coin through a wallet you control before it reaches an order.
Recent feedback rather than lifetime totals, and how they handled a complaint rather than how many stars they hold. Order small the first time with anybody untested, because a small order buys exactly the same information as a large one.
When the package arrives and matches, confirm receipt to release escrow. If it does not arrive or arrives wrong, open a dispute instead. Never confirm early to be polite or to move a slow order along.
Nexus Market