How can I use a capo chords transposer to easily change the key of a song for my guitar playing?

A capo is a device that you can place on the neck of your guitar to change the key of a song without having to learn new chords. By placing the capo on a specific fret, you can transpose the chords of the song to a higher key. This allows you to play in a different key without having to relearn the chord shapes.