by David M. Brewster (published by Hal Leonard) is a concise guide designed for absolute beginners with no prior music-reading experience. It focuses on practical playing rather than heavy music theory. Amazon.com Core Content & Features Simplified Notation : Uses a modern tablature (TAB)
You now know Em and G. Let’s add (easy: index on G2, middle on E2, ring on B3). With Em, G, and D, you can play hundreds of songs. Let’s do the most famous one: "Knockin' on Heaven's Door" by Bob Dylan (and Guns N' Roses).
There are many resources available to help you learn to play the guitar, including: