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Solo Guitar Playing 1" (4th edition) by Fredrick M Noad
-Great place to start for someone wanting to learn to sight read and play classical guitar.
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Guitar Soloing": The Contemporary Guide to Improvisation
-Musicians Institute book. Just started this one because it was recommended to me by a friend. You do need some basic theory and technique skills before diving into this one. It assumes you know the basics and focuses on you learning scales and applying them to create solos.
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Modern Guitar Method"
-Berkley School of Music book. Teaches sight reading for electric guitar. Goes at kind of a fast pace so I wouldn't recommend a guitar beginner to start with this. I'm using it in conjunction with the Noad book that is more beginner friendly. I use this one to push myself and challenge what I've learned.
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John Petrucci - Rock Discipline"
-A lot of great info, but i see it as more of an "exercise" book. Focuses on technique. There's lots of material here to help you build your speed and chops if you're into John Petrucci style playing and practice like you should.
I'd be interested to look into any books people could suggest for learning theory or sight reading.