Progressions in E — Bass (5-String)
Every chord the key of E contains, seen from the bottom: roots, distances, lines.
E major harmonizes to E – F#m – G#m – A – B – C#m – D#°; E minor to Em – F#° – G – Am – Bm – C – D. 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 (5-String) page with the tones to fill the space between roots.
Loop the workhorse moves — I–IV–V, ii–V–I, i–VI–VII — in E until your hand knows the distances, then start dressing the roots with fifths, octaves, and approach notes.