Capo and transpose.
The chords
An example in E major. Put in your song's chords.
Move it to another key
To suit a voice, or to play along with a recording. One fret is one semitone.
E majorAs written
Or pick the major key
Play it easier
Capo 4
Play C, G, Am and F shapes. They sound as E, B, C♯m and A.
Every capo, easiest first
Shapes in pencil are harder: barres, stretches or muted strings.
Capos go up to fret 7 here; higher up, the neck gets cramped and the sound thin.