Watch this video about how to play the guitar on HowStuffWorks. "String, Fret, and Finger Numbering" is your third free video lesson from iPlayMusic. When describing how to construct chords and play notes in the video lessons, the instructor refers to the strings and frets on your guitar as well as your fingers by number. This video is a good reference for how strings, frets, and fingers are numbered in the video lessons. See how to play the guitar in this video from iplaymusic.com.