The simplest way to learn new chords is through chord diagrams. They are exactly what they sound like, a diagram showing how and where to play chords on your guitar neck.
A Chord Diagram is just a map of the guitar's fretboard.
The thick black bar at the top is the guitar nut, its where the fretboard starts.
The thin horizontal lines below, are the frets
The vertical lines are the strings.
The circle above each string indicates an open string.