Tuning Guitar Via Ear & Advance Ear Training

Guitar Tuning Basics

Standard guitar tuning, starting from the thickest, lowest-pitched string (the 6th string) at the top of neck is:

.

E – A – D – G – B – E –

The high E string—the thinnest, highest-pitched string at the bottom of the neck—is known as the 1st string and all others follow suit.

How to tune with ear? :
Ans : use relative pitch as shown in the diagram below.
Match the sound of Open E 1^st String with 5^th Fret 2^nd String :
Match the sound of Open B 2^nd String with 4^th Fret 3^rd String :
Match the sound of Open G 3^rd String with 5^th Fret 4^th String :
Match the sound of Open D 4^th String with 5^th Fret 5^th String :
Match the sound of Open A 5^th String with 5^th Fret 6^th String :

...and, your guitar will be tuned