A Chord Form + 1 • B Flat Type Chords
B♭ type chords include B♭, B♭5, B♭m, B♭Maj7, B♭7, B♭6, B♭sus9, B♭m7.
So once we have some experience with the shapes & understand how they work, we can use them to create other chords by modifying the CAGED shapes. We can use formulas, or just experiment. Example formula: minor is R-♭3-5. From a Major chord, we flat (lower, one fret) the 3rd of the chord (wherever it appears). For the E form, the 3rd is the 1 fret on string 3. To create Em, we lower the fretted tone to the open string (G is the flat 3 of E). When we do this, we have Em. This is one way to figure out truckloads of chords.
As mentioned, when we play in the Natural minor, it isn't possible to create a strong A minor tonal center. The tones/chords of C Major tonify the tone C tone/chord, not the tone A and the chord A minor.We can use G♯m7♭5 instead of the triad for G♯o. We can also use a Bm7♭5 for the ii chord to make fingerings easier and more useful - as we can/did in Natural minor.