Metro Bus

 

Numerous routes, too many to list here. Just refer to website if you plan to use one. Each bus stop has detailed map posted by the waiting stop with detailed schedules and transfer/connection options. Fares are posted on the farebox as you get on the bus.  Pay $1.25 on regular Metrobuses, $3 on express buses. 
 
Bus service is somewhat less reliable than metro trains. Once you are within the immediate D.C. downtown area, the bus service becomes a victim of regular street traffic, so I would use metro train. 
 
Help

If you are already at the bus stop, ask locals or bus driver (of any bus that comes). If you have any questions before you come to D.C. area, contact me – I will try and help you as much as I can.