About the Bbsus2 chord
To play Bb suspended 2nd, use the first shape above. Place your index finger on the 1st fret of the E string, your ring finger on the 3rd fret of the G string, and your pinky finger on the 3rd fret of the A string. Leave the C string open. Strum all four strings and check that each one rings cleanly.
Root
Bb
Quality
Suspended 2nd
Notes
Bb · C · F
How the Bbsus2 chord works
Bb
Root(1)
The home note. It gives the chord its name.
C
Major second(2)
An open-sounding second that replaces the third.
F
Perfect fifth(5)
Adds strength and stability.