lesson 4-04: 6/8 strum patterns
This lesson will teach you to strum in 6/8 time. This is a relativley common time signature. Even if you don't use it that much, learning to strum it and read the rhythms, will improve your strumming ability.
Learning to play in 6/8 is essential, if you are taking the RGT grade 3 electric guitar exam, or above.