For Once in My Life by Stevie Wonder is played in the key of F at a intermediate difficulty level, originally released in the 1960s. It uses 3 chords — F Bb C — arranged in the I-IV-V progression.
About the I-IV-V progression
The I-IV-V progression uses the three primary chords of the key — nothing else. It's the harmonic foundation of blues, folk, country, and early rock and roll. Learning to switch between these three chords fluently in every key is a fundamental milestone for beginner guitarists.
Playing in the key of F
F major is a stretch for beginners. The F chord itself needs a barre or partial shape, and Bb (the IV chord) is a full barre. Many players capo the 3rd fret and use D-major shapes to make this key easier.
Related songs
More songs in the key of F
More songs using the I-IV-V progression
Learn to play For Once in My Life by Stevie Wonder on guitar. It sits in the key of F and uses the I-IV-V progression with the chords F Bb C.