Hi, my name is Tim Ambrosius. I'm a professional guitar tech. I'm going to show you how to tune a guitar. First off, you want to make sure that your "e" is in tune using a tuner or a tuning fork. Then, you're going to tune everything off of that "e" string. What you want to do is go to the fifth fret on that "e" string, hit it, and then hit the next open string down. So, when it's in tune they're going to sound exactly the same. Then, what you do is move up to the next string, the fifth fret on the "a" string, hit that, and hit your next open string down. Make sure they're the same note. Same thing with the "g", fifth fret on the "d", same note. Then the only other alternate one is on your "g" string you want to go on the fourth fret, so that's a "b" note. You want to hit the "b" on your "g", and then hit the open "b" string. Make sure they're the same note. Then back on the "b" string, you want to hit the fifth fret again, and hit the open "e". And, there you have it.