I've been a happy vim user for many years, over a decade. But I was shocked at how this talk, published on YouTube in 2018 from a recorded lecture by an engineer at Yelp named Leeren Chang, basically made vim’s internal model “click” for me and made vim even more fun to use. I really feel the presenter did such a great job showcasing vim ideas — conceptually, visually, and by direct example — that, by the end, I downloaded the talk into my “great tech talks” stash and labeled it, “vim’s missing manual.”

Here it is: https://youtu.be/E-ZbrtoSuzw