First step, get the app on your phone (https://www.wmata.com/fares/MobilePay/SmarTrip-App.cfm/1000)
Use your phone maps app and use the transit option and it will guide you through the city. Is an affordable option if you want to see a little bit more than just the memorials.
Great option to commute to/from the airports if your are a relaxed traveler.
