I know that this is quite an old thread, but as it's still on the first page, I thought that there might still be people who come to it looking for advice on teaching themselves how to play guitar, so I wanted to offer my own tips. I gravitate heavily towards metal and hard rock, but these are useful skills for any genre.
You'll want to learn about the following (wall charts are good):
- The fretboard and where notes are situated on it
- The major scale
- The minor scale
- The pentatonic scale
- The minor pentatonic scale
- The blues scale
- Major chords
- Minor chords
- Power chords
- Seventh chords*
- Augmented chords*
- Suspended chords*
- Guitar tablature ("tabs")
- Sheet music
It's a lot of theory work, but if you give yourself a good grounding in theory before you pick up that songbook, you're going to find it infinitely easier to get the hang of exactly where, when, how and why you need to do things such as sustains, hammer-ons, legato slides, tremolos, bends, trills, harmonics, vibratos, ghost notes and the likes - getting a good book on guitar terminology will help you understand just what people are talking about when they spew out these words, too.
I personally can't stand the Dummies books and I tell everybody who will listen that if they're serious about learning guitar, the Dummies books will make them want to throw their guitar across the room. I'd suggest going into your favourite music store and enquiring about lessons, charts, songbooks and books specifically for different things. I would advise against getting all-rounder beginner's books: these books are the reason that so many beginners achieve a lacklustre sound, as they skip over important care and play techniques. Ask about books relating specifically to chords, specifically to scales, specifically to reading tablature and the likes.
* Don't bother with these chords until you've mastered all of the listed scales and the other listed chords. These will be way too hard at such an early stage, and without learning the other things first, you won't have the necessary grounding information.
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Similarly, don't pick up the first guitar that you see. Be prepared, especially in the world of electric guitars, to spend over $300 if you want a quality guitar. Certain brands will be cheaper than others - you can achieve with a $600 Schecter the exact sound quality that you'd receive with a $1000 Jackson. You don't need to go all out: immediately turn away from guitars with wammy bars / floyd roses, floating bridges and lockable tuning pegs (if you don't know what these are - don't worry! Tell the sales assistant that you want to avoid them). These are too advanced for a beginner to bother with, and unless it's the only guitar that you'll ever have - and trust me, it won't be - they're like buying a puppy with two tails.
Do not purchase a beginner's pack. The guitars are poorly made and the amps will make even a brilliant guitar sound inferior. Do not import your guitar, as the guitars are disassembled during shipping and this permanently alters the guitar. Go to your music store and speak to the sales assistant. Pick up a few different guitars from a few different brands. Hold them standing, hold them sitting, and strum them. Don't be afraid of sounding silly - you don't have to plug it into an amp if you don't want to. The sales assistant should be more than happy to plug the guitar in and play it for you if you want to hear it through an amp.
Hold the guitar level to your eyes and look down the neck. Follow the strings to make sure that the neck isn't tilting to one side or another. Inspect the guitar for cracks, scratches or other defects. Give the guitar a good, hard shake - no rattling? That's good. Play the guitar on the very last fret (this is the fret closest to the pickup) on the top string. Is it buzzing? Put that girl back and pick a different one - for your first guitar, it's not worth getting her professionally tailored. It's better to pick the perfect one straight away. Above all, make sure that she's comfortable. Flying Vs look great if you want to go for a heavy metal look, but they're ridiculously uncomfortable to most people.
When you find the baby that's right for you, don't let the sales assistant get you a stock one. There is such a thing as a guitar lemon. Buy the exact guitar that's in your hands. Ask the store if they'll be kind enough to tune it for you and perform a minor service - this should be free of charge.
You don't need to spend an absolute fortune to get a good guitar, but you should still look at the decent brands. If you want to get a Fender, you don't have to jump straight into a Telecaster - go for a Squire instead. If you want to get a Schecter, you don't have to go straight for a Hellraiser - you can get an Omen Extreme. For your first guitar, though, unless you're absolutely set on it, don't bother getting a Jackson or a Les Paul.