Dom 7

Quote from: https://www.guitar-chord.org/7.html
"The 7th chord (also known as dominant 7th) adds another tone to the major triad chord.
As the name implies, the added tone is seven steps from the root (following the scale).
This chord category is especially common in blues.

There is 8 different 7 chord types:
Dom 7 - Maj 7 - Minor 7 - MinMajor 7 - Min7b5 - Dim7 - Maj7#5 - 

Learn these 3 shapes for the Dom7 - easy to remember and they can be moved around = all Dom7...with 3 shapes.

Want to play some open Dom7 chords..?  Here is an blues in E: