While it can be easily be said guitar is the most popular instrument in the world, the differnt playing styles that come from culture and genre make it a universally significant instrument with diverse applications.
The Guitar's tuning is E A D G B e (Tune from closest to furthest from you in that order)
Some basic chords are E, A, D, G, C, E minor, A minor, D7, A7, and F. These are basic chords used in many songs.