4 Ways to Tune Your Guitar
To An Electronic Guitar Tuner - just follow the instructions
To Itself Using Fretted Notes (If you can, tune the 5th string open to an 'A' from a tuning fork or other instrument)
Play the 6th string 5th fret, then the 5th string open, and tune the 6th string until they are the same (use your RH to turn the key)
In the same way, tune the 4th string open to the 5th string, 5th fret
Tune the 3rd string open to the 4th string, 5th fret
Tune the 2nd string open to the 3rd string, 4th fret
Tune the 1st string open to the 2nd string, 5th fret
To a Keyboard or Piano Tune the 6th string open to the note E two below middle C
Tune the 5th string open to A two below middle C
Tune the 4th string open to D below middle C
Tune the 3rd string open to G below middle C
Tune the 2nd string open to B below middle C
Tune the 1st string open to E above middle C
To Itself Using Harmonics (To get harmonics, touch the string very lightly with your LH, exactly above the fret wire, and pluck the string hard with your RH)
Tune the 1st string open to the 6th string 5th fret harmonic
Tune the 2nd string open to the 6th string 7th fret harmonic
Tune the 5th string 7th fret harmonic to the 6th string 5th fret harmonic
Tune the 4th string 2nd fret to the 6th string 12th fret harmonic
Tune the 3rd string 4th fret to the 6th string 7th fret harmonic