King Schools continues to provide direct and simple/easy-to-use resources for pilot training. I started with King Schools Videos on VHS. Then, DVDs became available part way through my training to eventually become a flight instructor. I think I bought every single one that was available, even ones that were not necessarily for me, but my aviation curiosity got the best of me. Now, it is all online, so keeping current is so easy.
They present what is needed is a very effective manner. I appreciate the humor, too!
(As a side note, I have tried one or two other online FIRCs, and they were simply not as engaging, even boring. I will stick with King Schools for the future.)
Airplane Flight Instructor Refresher Course (FIRC)