A normal guitar that is commonly used has 3 to 4 octaves. The lowest pitch is E2 and the highest is E4. octaves help the guitar players what songs are playable in guitars. It is because some songs are too low or too high that notes needed to play them are not present in this string instrument.
Adjusting the pitch of a song will be possible to play it on the guitar. The first three frets of the guitar will let you play C or Do. Knowing the chords will help you play the guitar more efficiently and faster to read guitar chords. With this, you can play any song you want.