About the F#7 chord
To play F# dominant 7th, use the first shape above. Place your index finger on the 2nd fret of the E string, your middle finger on the 3rd fret of the G string, your ring finger on the 4th fret of the C string, and your pinky finger on the 4th fret of the A string. Strum all four strings and check that each one rings cleanly.
Root
F#
Quality
Dominant 7th
Notes
F# · A# · C# · E
How the F#7 chord works
F#
Root(1)
The home note. It gives the chord its name.
A#
Major third(3)
The major-third interval that establishes the chord's major base.
C#
Perfect fifth(5)
Adds strength and stability.
E
Minor seventh(♭7)
Adds the defining minor-seventh color.