Build Your Own Thrust Vectored Rockets for Vertical Landings Like SpaceX
After seeing the headline I thought "If this is by anyone other than Joe Barnard they've really missed an opportunity here". Glad to see it's him! His videos are always in-depth and don't hand-wave or gloss over the various technical problems he encounters/fixes. He also does detailed breakdowns on the successes and failures of his launches which I really enjoy.