Progressions in D — Bass VI
Every chord the key of D contains, seen from the bottom: roots, distances, lines.
D major harmonizes to D – Em – F#m – G – A – Bm – C#°; D minor to Dm – E° – F – Gm – Am – A# – C. To the rest of the band those are chords — to you they are a map of root movements, and each one links to its Bass VI page with the tones to fill the space between roots.
Loop the workhorse moves — I–IV–V, ii–V–I, i–VI–VII — in D until your hand knows the distances, then start dressing the roots with fifths, octaves, and approach notes.