The guitar is a versatile and expressive instrument that contributes rhythm, melody and flavor to many music genres. Capturing and enhancing that flavor takes good taste, real talent, and effective techniques.
You'll need a range of skills: the ability to mic amps and acoustic guitars, add the right combination of effects and EQ, tame the beast using appropriate compression, and more. There's a lot to learn! Here's a range of tutorials from basic to advanced that explain it all.