Justin Sandercoe has thought long and hard about how to teach people to play the guitar, and how to do this over the internet. He has come up with a well-designed series of courses that will take you from nowhere to proficiency. I tried to learn how to play years ago, using books, and got nowhere. I've been using Justin's site for just over a year and I feel I've made real progress. What's more, Justin offers his lessons for free - a boon for any young player who has the urge to play, but whose pockets are empty. I've seen and used other sites for learners: none of them offer as clearly marked a road as Justin does.
A major chord is made from the I, III and V notes, so C major uses the notes C, E and G. To make a major chord into a minor, you flatten (lower the pitch by one fret, or a half-step) the III note. This means C minor is made up of C, Eb (flat) and G. So now, from the E major scale, E = I, F# (sharp) =II, G# = III, A = IV, B = V, C# = VI and D# = VII, you can work out both the major and minor chords. Sharps are just the opposite of flats, so you raise the pitch by one fret (or half-step). When you're working out the E minor chord, you have to flatten the F#, which just makes it back into a natural (neither flat nor sharp) F.
With that in mind, the inverse to this rule isn’t always true. During the Folk Boom of the 1950s and 60s, there were actually quite a few musicians who put nylon strings on steel string acoustics. This gave the guitar a very warm and relaxed tone, though should you choose to do this be aware that you’re going to get a lot less volume and a reduced response across the entire frequency range.
We were privileged to have worked with hundreds of top artists and educators who authored the original magazine articles and then recorded audio lessons in their own studios. While video is the medium of choice today, these 1,200+ audio lessons still deliver amazing instruction from some of the best in the biz — perfect for those long drives and commutes!
Artistworks is a great concept. I am a pupil of rock guitarist Paul Gilbert! Let me say that again - I am a pupil of rock guitarist Paul Gilbert! Yes, THE Paul Gilbert! The idea that top notch, internationally recognised musicians are teaching you from the comfort of your own home, is still amazing to me. And they speak to YOU. They tailor their feedback to you and your level. Your playing will improve immeasurably. So, what are you waiting for? Do it now before we all wake up and it turns out to be a dream after all.
On almost all modern electric guitars, the bridge has saddles that are adjustable for each string so that intonation stays correct up and down the neck. If the open string is in tune, but sharp or flat when frets are pressed, the bridge saddle position can be adjusted with a screwdriver or hex key to remedy the problem. In general, flat notes are corrected by moving the saddle forward and sharp notes by moving it backwards. On an instrument correctly adjusted for intonation, the actual length of each string from the nut to the bridge saddle is slightly, but measurably longer than the scale length of the instrument. This additional length is called compensation, which flattens all notes a bit to compensate for the sharping of all fretted notes caused by stretching the string during fretting.
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. 
The top, back and ribs of an acoustic guitar body are very thin (1–2 mm), so a flexible piece of wood called lining is glued into the corners where the rib meets the top and back. This interior reinforcement provides 5 to 20 mm of solid gluing area for these corner joints. Solid linings are often used in classical guitars, while kerfed lining is most often found in steel string acoustics. Kerfed lining is also called kerfing because it is scored, or "kerfed"(incompletely sawn through), to allow it to bend with the shape of the rib). During final construction, a small section of the outside corners is carved or routed out and filled with binding material on the outside corners and decorative strips of material next to the binding, which are called purfling. This binding serves to seal off the end grain of the top and back. Purfling can also appear on the back of an acoustic guitar, marking the edge joints of the two or three sections of the back. Binding and purfling materials are generally made of either wood or plastic.

When playing seventh chords, guitarists often play only subset of notes from the chord. The fifth is often omitted. When a guitar is accompanied by a bass, the guitarist may omit the bass note from a chord. As discussed earlier, the third of a triad is doubled to emphasize its major or minor quality; similarly, the third of a seventh is doubled to emphasize its major or minor quality. The most frequent seventh is the dominant seventh; the minor, half-diminished, and major sevenths are also popular.[79]
Quartal and quintal harmonies also appear in alternate tunings. It is easier to finger the chords that are based on perfect fifths in new standard tuning than in standard tuning. New standard tuning was invented by Robert Fripp, a guitarist for King Crimson. Preferring to base chords on perfect intervals—especially octaves, fifths, and fourths—Fripp often avoids minor thirds and especially major thirds,[102] which are sharp in equal temperament tuning (in comparison to thirds in just intonation).
As you start practicing, your fingers may be sore for a while, but that will pass with four to six weeks. One thing I want to warn you about is that new guitar players can get frustrated when they can’t play clean chords because they try to switch between chords too soon. Often, they try to switch chords before they’ve really learned and memorized each chord shape. For now, don’t worry about switching chords and just work on each shape, getting them down, and going right to them.
If you are brand new to the guitar, we recommend you start with the Beginner Guitar Quick-Start Series. It’s a collection of 12 step-by-step videos that will give you a solid foundation for all future lessons. You’ll learn how to play guitar, how to hold the guitar, how to tune your guitar, how to strum the guitar, how to play your first chords, and even how to play your first song on guitar.
SFCM produces some of the most successful and influential classical guitarists in the world. Spearheaded by renowned faculty and complemented by visiting artists such as Marcin Dylla, the department honors the tradition of the classical guitar while cultivating innovation. The Harris Guitar Collection, housed at SFCM, gives students a chance to see—and play—some of the most extraordinary guitars of the last two centuries.