Hello this is Kevin again site owner of expressive-guitar-lessons.com
One of the great evolutions in technology is the ability to get anything on the go. Now even for guitarists you can bring your guitar teacher with you on your ipad or iphone. These apps below give you several options for looking up chords and even tabs quickly.
You get cool interfaces where you can actually strum the chord and hear the distinct character of each chord you play.
Disclosure: I am a paid affiliate of itunes.com and amazon.com
Guitar Chord Resource
9th Chords 13th Chords
"Open Chords" are the most common shapes used on guitar. They are called "Open" because they all utilize the open strings and do not require barring.
Get a guitar chord poster to keep on your wall for quick reference. You can try a new chord every day. Here is a poster from Amazon.com below.
Disclosure: If you buy through these links I receive a small commission.
"Bar Chords" extend the open chords up the neck with the bar acting as a movable capo. In the example below, your first finger bars all the way across the 3rd fret and use fingers 2, 3, and 4 for the rest of the notes. If you notice this is really the same shape as an E Major open chord just moved up three frets.
I recommend this app that works with iphone or ipad. You have access to hundreds of chords with an easy attractive interface. You can even "strum" the screen to hear the distinct sound of each chord. It's like having a music teacher everywhere you go!
Disclosure: I am a paid affiliate of itunes.com
"Extended Open Chords" keep the same shape as open chords but travel up the neck for very exotic sounds.
"Triads" playing only three notes at a time rather than strumming all strings.
"Jazz Guitar Chords" feature chord extensions such as 7th, 9th, 11th, 13th scale degrees. Emphasis is placed on the critical "character" notes that define the chords.