Chords are made with distinct rules or formulas which gives a unique sound to different chord types. While there are hundreds of chords they are made from a small set of formulas. So it makes sense to learn and understand these formulas that make these chords rather than learn hundreds of chords.
Chords are based on scales so understanding the major scale is important to constructing chords. To understand how the major scale works see this article : The Major Scale
Select a chord type below:
Major
Minor
Seventh
Minor Seventh