key signature
F minor
F1G2A♭3B♭4C5D♭6E♭7
4 flats, written B♭ E♭ A♭ D♭
The chords that live in it
Fmdegree 1 · minorGdimdegree 2 · diminishedA♭degree 3 · majorB♭mdegree 4 · minorCmdegree 5 · minorD♭degree 6 · majorE♭degree 7 · major
Built by stacking thirds inside the scale and asking what quality comes out, rather than from a table of roman numerals.
What is true of it
F minor has 4 flats.
They are written in this order, always: B♭ E♭ A♭ D♭.
Its notes are F, G, A♭, B♭, C, D♭ and E♭.
Relative: A♭ major has the same 4 flats. Parallel: F major has 1 flat, which is why changing mode changes the signature by three.
Every key
C♭ majorG♭ majorD♭ majorA♭ majorE♭ majorB♭ majorF majorC majorG majorD majorA majorE majorB majorF♯ majorC♯ majorA♭ minorE♭ minorB♭ minorC minorG minorD minorA minorE minorB minorF♯ minorC♯ minorG♯ minorD♯ minorA♯ minor