Chords
A chord is a group of three or more notes, which can either be played simultaneously, or played separately. In guitar music we also refer to two-note chords (known as dyads) as chords. The most common example of this would be power chords, which consist of two notes a perfect fifth (7 semitones) apart. Below are links to chord charts of different categories, and a selection of relevant lessons from this website. If you are an absolute beginner I suggest learning how to read chord diagrams, then learning some beginner chords.
Chord Charts
Beginner Chords
Open Chords
Moveable Chords
Major
Major
Major 6
Major 7
Major 6/9
Major add 9
Minor
Minor
Minor 6
Minor 7
Minor add 9
Minor(major 7th)
Seventh
7
7 (with extensions)
7 suspended
Other
Power Chords
Suspended 2nd
Suspended 4th
Augmented
Diminished
Playing Chords
Strumming/plucking
Basic strumming patterns
Exercises - Chord changes
Chord Theory
How to read chord diagrams
Chord formulas
Constructing and naming chords
The Major Triad
Minor Chords
Sixth Chords
CAGED theory