There are various ways to tune the guitar. The easiest and most accurate method would be with the use of an electronic tuner. However, at this point we will learn how to tune the guitar to itself. This is perhaps the most convenient way though it does take a degree of aural discrimination.
First, let’s consider the notes of the guitar on each string to the fifth fret..
The idea is to compare and tune each string to the one below it. (In pitch). We will assume that the sixth string, low E is itself in tune. Fretting this string at the 5th fret will produce the note, A. Compare that with the pitch of the open 5th string. If the note produced sounds lower than that on the 6th string, turn the tuning peg or machine head to increase the tension and thus the pitch. If the note on the 5th string sounds too high, decrease the tension of the 5th string so that the A on the 6th string and the A on the 5th string sound the same.
Now that the 5th string is in tune, compare the D note on this string with the D note on the open 4th string. Continue this processes for the 3rd string.
When you reach the 2nd string, you’ll notice that the B is produced by fretting the third string at the 4th fret. Continue tuning the first string by fretting the second string at the fifth fret.