How can I learn guitar pretty fast ?

the first thing you should learn to read is tabs and music.
tabs are easier to learn, but actual music will help you out more in the long run.

then, practice scales. a lot. it will help when you get into soloing.
and don’t forget to have fun! learn to play songs that YOU like. it will make the learning a lot better
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Practice as much as you can. It’s almost impossible to just pick up a guitar for the first time and be good at it right away.
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One of the most annoying things most beginning guitarists encounter is developing calluses on their finger tips from having to press down on those freakin’ unGodly strings. Especially if your learning on certain model acoustic guitars. So here’s a tip for you. Buy yourself a capo that works well with your guitar. Place it on the 2nd, maybe 3rd fret. Now of course that will raise your standard EADGBE tuning up a couple of steps so you’ll need to tune your strings back down to your normal e,a,d,g,b,e . The point of all this is it should make your strings much easier to finger, and the action will be a bit closer to the fretboard. Now I don’t know if this is gonna help you learn to play any faster, but if you’re not having to torture your fingers teaching yourself. that’s half the battle right there….. hopefully.
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Loooooong time Geetar player

This methods has excellent reviews, to learn how to play guitar and play virtually any guitar song you hear.
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http://sturly.com/learn_to_play_guitar_fast