The first thing you should know is what the strings should be tuned to, which is shown below:
There are several options when it comes to achieving this tuning:
3. Alternative Method of Tuning
2. Using an Electronic Tuner
A very easy way of tuning your guitar. You either connect the guitar to the tuner via a cable, or use the in-build microphone. The tuner will then tell you whether the string is sharp or flat etc... Some tuners however seem to fluctuate a lot, which makes it difficult. Tuners come relatively cheap so it's worth the investment. You could also consider using our online guitar tuner.
If you tune the bottom E string correctly (for example by using a piano), the other strings can be tuned using this method:
Play the 5th fret on the E string and tune the A string to this note.
Now play the 5th fret on the A string and tune the D string to this note.
Now play the 5th fret on the D string and tune the G string to this note.
Now play the 4th fret on the G string and tune the B string to this note.
Finally play the 5th fret on the B string and tune the e string to this note.
4. Drop D Tuning
The guitar can in fact be tuned in many other different ways, on of the most common being drop D tuning, in which the E string is tuned down to a D. This can be achieved from a guitar tuned to E by tuning down the E string until the 7th fret on this string plays an A.
Source : www.igdb.co.uk