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.
An example: at fret 5 for an A form, the index will be at a D tone, so the chord will be D Major. Every flat name has a sharp equivalent [enharmonic, same thing, different name]: A flat = G sharp, B flat = A sharp, D flat = C sharp, E flat = D sharp, G flat = F sharp. Yet, for Major type chords, all of them are typically flat names except G flat/F sharp, where both are used.
These Drop D power chords can be played as a 3 string bar chord (string 6-5-4) using the index, the 2, the 2 & 3, the 3, or the thumb over the top of the board. For teaching groups, using the thumb is one of the fastest ways to get results.
First, determine fingerings. Then, play the chord scale (use both versions of E7 - unless high position is uncomfortable). These are solid voicings for fingerstyle comping. For strumming, the chord shapes themselves create most of the muting (5 & 1 strings). We can choose fingerings based on leaving a finger (or 2) free for tone toggling. Once the chords are in the hands, we play progressions. Try a i-VI-ii-V (we don't need to write all of the chord symbols, all the time). Then, write progressions. Experiment. Record it. The voicings here are just one way to play these chords, and is movable to all positions/keys.