Buying tickets
You’ll need either a paper ticket or an IC travel card (see below) to ride. Tickets can be bought at station ticket machines (English-language guidance available) or ticketing windows. You can figure out the price of your ticket by looking at the route and fare boards found above most ticket machines. Just find the station you’re going to on the map, note the price listed next to the station name and buy a ticket of that value from the machine.
There are also several apps and websites you can use to find routes and ticket prices. One of the longest-running ones is Japan Transit Planner, while HyperDia is available in both app and browser formats. Tokyo Metro and Toei Subway also have a free app called Tokyo Subway Navigation for Tourists.
Once you have a ticket, stick it into the slot in the ticket gate (turnstiles) to pass through. Make sure to retrieve your ticket once it comes out at the other end of the gate, as you’ll need it to pass through the gate at your destination.