These videos are great! I particularly liked the one about root locus. I don’t know why using symbolic techniques for pole placement isn’t the primary method taught in university - it just makes so much sense.
I have added a video about Observers and why they are important, especially when controlling hydraulic actuators.
I know this may be a little geeky. Even if you don’t understand the math is it good to watch because estimating the actual acceleration is very hard to do accurate. The video makes it clear that unless one has infinitely fine resolution it is difficult to accurately calculate the acceleration unless an observer is used.