Most commuters use Suica or Pasmo IC cards (or mobile wallet versions). Tap in when entering and tap out when exiting ticket gates.
When transferring between JR East and Tokyo Metro, you may pass through yellow transfer gates or exit/re-enter. IC cards auto-calculate the joint discount fare.
• Local (各停): Stops everywhere
• Rapid (快速): Skips minor stations
• Express (急行): Skips more
• Ltd. Express (特急): Fastest, may need surcharge
Phone on silent, no calls on board. Wear backpacks on your front during rush hour. No eating on commuter trains (ok on Shinkansen).