Beginners should start with How to tune a guitar.

What we guitarists consider “standard tuning” has been around pretty much since the fifth and sixth strings were added to the instrument in the late 1700's. And, artists being artists, “non-standard” or “alternate” tunings have existed for just about as long. For the sake of our discussions, we will divide guitar tunings into three categories - standard tuning, open tuning, and alternate tuning.

Standard tuning is what most guitarists are taught from day one (low to high or 6th string to 1st):

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On Guitar Noise

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