Do you count while playing guitar?
You should count before you begin playing, especially with a metronome, as this will help you get in the groove. If you're trying to imagine a part in your head, or figure out how it goes, or just follow along with some music you can count and tap or count and conduct.
How many beats does a guitar have?
In common time a whole note consists of four quarter notes or four beats. Each half note is two beats and quarter note is one beat. There are other possible signatures, 3/4, 2/4, 6/8, 7/4 are some.