F Dominant 7th

F7 is a solid intermediate shape once open chords feel steady. The first shape is the easiest voicing: 4 fretted strings and 0 open strings. Put your index finger on the 2nd fret of the G string. Put your ring finger on the 3rd fret of the C string. Put your index finger on the 1st fret of the E string. Put your pinky finger on the 3rd fret of the A string. Strum all four strings and check each one rings cleanly.

F7 is F, A, C, Eb. Those notes make a dominant 7th chord. Play them in any order and you still get F7.

Bluesy tension that wants to resolve. The engine of blues, jazz, and early rock. Chord quality is the interval pattern above the root. That pattern is what you hear as dominant 7th.

Songs that use F7 include What'd I Say, and Shake Rattle and Roll.