Watch the Rhythmic Subdivisions online guitar lesson by Angus Clark from Hard Rock Survival Guide: Rhythm
Rhythm is the organization of sound over time. The time is marked by the tempo, which is measured in beats per minute. The beats are grouped into measures. The measures are grouped into phrases. The basic grouping of beats per measure is called the time signature. Most of the examples in this course will be in 4/4 time, which is a grouping of four beats per measure. The beats are called quarter notes. Quarter notes can be further subdivided into eighth notes and then sixteenth notes. Quarter notes can be combined to create half notes and whole notes.
Because music is played by humans, the way you play these subdivisions of the beat is what creates your feel. There are just as many versions of right as there are wrong. We're going to do all of these concept exercises vs. the metronome. The metronome is a guide to show you if you are keeping time. You are the one keeping the time. Not the metronome. Don't get it twisted. If you are doing this right, you should be able to turn the metronome down low enough so that you'll only here it if you get off of it, or if you are not playing on the downbeat.
Again, make sure that you have zero dead air between chords, make sure that you target the next chord shape so that you nail it in time, every time.