The Golden Rule: Uptown = North toward the Bronx and Upper Manhattan (Central Park, Columbia University, Yankee Stadium). Downtown = South toward Lower Manhattan and Brooklyn (Wall Street, Brooklyn Bridge, Statue of Liberty). This is literally printed on every platform sign, but it confuses tourists because most cities don't use geographic directions for transit.

Express vs Local Lines: Express trains skip stops and save 10-15 minutes on longer trips. East Side: 4/5/6 line — The 4 and 5 are express, 6 is local and stops everywhere. West Side: 1/2/3 line — 1 is local, 2/3 are express. The N/Q/R/W runs down Broadway hitting Times Square, Union Square, and continues to Brooklyn. Learn these four main spines and you'll navigate like a local.

Major Transfer Hubs: Times Square-42nd Street is the massive central hub connecting nearly every line — Expect crowds and confusion. Union Square (14th Street) connects the East Side 4/5/6 with the L train to Brooklyn and the N/Q/R/W Broadway line. Columbus Circle connects the West Side A/B/C/D with the 1 train. 59th Street/Lexington connects the East Side lines with the N/Q/R/W.

Essential Apps: Download Citymapper before you arrive — It's more accurate than Google Maps for NYC transit and shows real-time delays, platform changes, and the fastest walking routes between stations. Having navigated transit systems in 40+ cities, NYC's grid-based system is actually quite logical once you understand that numbered streets run east-west and increase as you go north.