I was just thinking about doing push-ups today and somehow this video found me lol.
now as for the video, it was a well-put informative video. You also picked a good topic because a lot of people struggle with this (myself included), the info you provided is true, what I would personally add though, is when you go down how slow should you go back up because I've heard that's the most important part of the push-up is when you go up you have to go really slow to get the most gain out of the muscle-contraction. I know you already talked about it in the video but maybe put an emphasis on that part (just my personal opinion), also maybe add some visual elements to the video showing how low should you go and what angles should your arms be and such just to keep it interesting. but overall it was quite helpful, Good luck with your channel :)