Learning II – V – I chord progressions in minor keys will give you, along with II – V – I in major keys, the foundation of all improvisation. It takes a little getting used to, but once you learn it, you’ll be thrilled at how it will make you sound.
Learn how to properly voice II – V – I progressions in minor keys. This is infinitely useful to truly make your playing sound rich.
Learn the proper scales that are used over top of II – V – I progressions to help you improvise.