For those of you who play guitar, you might have noticed that some of my tasty licks aren’t so tasty. I’m no Stevie Ray Vaughn. You don’t need to be superstar to have tons of fun with this stuff. Despite not being the best guitar player, I’ve played my songs in front of 1000’s of people in live venues, had songs I’ve written and recorded played on San Diego’s leading rock station, and played in some super cool seedy dive bars to drunken hipsters. That’s just a few among a countless other memorable experiences. You don’t need to be a genius– half the battle is just showing up.
I have heard how giving you are in so many respects of music schooling and I must say that I am impressed. You remind me of the pure idealism that we had in starting Apple. If I were young, with time, I'd likely offer to join and help you in your endeavours. Keep making people happy, not just in their own learning, but in the example you set for them. 
We now know three chords: G major, C major, and D major. Let's see if we can put them to use in a song. At first, switching chords will take far too long to be able to play any songs properly. Don't give up, though! With a bit of practice, you'll be playing away, sounding great (this tutorial on switching chords quickly might also be of some help). In our next lesson, we'll start learning about strumming, so you can come back to these songs, and be able to play them better.
@John Dyhouse: The thing about the chord buddy that is unique is that you can teach yourself quickly. yes you will need to build up your finger pad but you will need to do that anyway without the chord buddy. The main purpose of it is to teach you hand placement, sound, and rythmn first. Then after you have mastered that you can move on to learning more on the topic you are discussing.
I concur, lots of very good lessons on Guitar Tricks. However, one thing I don’t see commented on is that for most of the song lessons and some technical lessons you cannot download and print the music (which I understand for published songs because it is protected) but the on-screen music notation doesn’t scroll with the video lesson, jam track etc. (like it does on several other lesson sites). All that is visible is one 8 or 12 bar section of the song. In other words, short of memorizing the song, there is no way to play along. Made the comment to GT customer support and they said essentially – Yeah we know. My analogy is a canoe without a paddle. Not totally useless but almost.
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Sound familiar? I know what that’s like… I’ve been there, and I’ve had several students that have been there. Playing the same licks, the same riffs, the same songs on your guitar over and over and over again just gets old so fast.  You’re willing to put in the work, you’re willing to practice hard, BUT WHAT SHOULD YOU PRACTICE?? HOW CAN I LEARN TO BE CREATIVE? IF ONLY I COULD PLAY THAT ONE SOLO!

Arpeggios are just chords, but how they are played is a special technique unto itself. The left hand playing single notes and the right hand strumming a chord is such a great technique builder. I can’t express enough how important it is to work on these. Combining technical and musical efforts in a logical progression is without a doubt the best way to become a great guitarist.
This guitar trick is a variation on artificial harmonics, which itself is a variation on natural harmonics. The natural harmonics are most commonly played on the 5th, 7th, and 12th frets. To play these, you lightly press the left hand on top of the fret without pressing the string to the fret. Then, you pick the note. To make an artificial harmonic, you regularly fret a note with the left hand and then use your right hand index finger to lightly press on that string twelve frets above the fretted note. Then, you pick the string. With this technique, you have to hold the pick between the thumb and middle finger. Finally, to play harp artificial harmonics, you alternate plucking a note using the right hand ring or pinky finger with picking artificial harmonics. This creates a harp-like sound! This technique works well when you can fret a chord using four or more strings without repeating any notes. The video below shows the great guitarist Lenny Breau describing how to accomplish this:
Next, concentrate on your "fretting hand" (the hand closest to the neck of the guitar, when sitting in proper position). The thumb of your fretting hand should rest behind the neck of the guitar, with your fingers in a slightly curled position, poised above the strings. It is extremely important to keep these fingers curled at the knuckles, except when specifically instructed not to do so.

I have checked out Justin's site and found it to be comprehensive and informative. I have always felt that learning about music and especially music theory applied to the guitar, is helpful in finding your own unique voice on the instrument and expanding your creative horizons. Along with his insight into teaching and his fantastic abilities on the instrument, Justin has created a powerful go-to-place for anyone interested in exploring the instrument to their potential. Just don't hurt yourself.

4.) Check the guitar’s string height by pressing down on the first, second, and third fret. You should be able to do so with minimal effort. Come to the 12th fret and press down. The distance from the top of fret to the bottom of the string should be no more than three times. If it is five times, the guitar may have a warped neck or too high of a bridge.