One of my favorite YouTube channels, deramp5113, does information/instruction videos about 70s minicomputers. Part way through his Altair 8800 series, he does a mini-series on CP/M. Everything on his channel is worth watching, but here's the first CP/M video:
I have so many CP/M programs my grandfather wrote in my garage. Never got to see them run but it’s cool to see people are still messing around with the OS in some capacity.