Motivation
Watching folks doing things you’ll never do or better yet hope to do. Watching them do those things makes you try or try harder. If you need to watch this everyday or even every week, it might help to revisit why you really want to train or why your training choices or environment is not motivation enough.
Explainers
Content that tells you what you are doing is working for you. Or better still why what you are doing is not working or will not work. It comes in the most entertaining forms (most YouTubers) down to debates, fights and books. This is for true enthusiasts or people paying the bills with coaching.
Instructional
How to squat, how to plate your food, what is meal prep, how much protein do you need. You watch it once, maybe twice or a third time if it is complex and you start using it. If you pick the right content, you watch it once and use it for life. If you have to rewatch this stuff every other week, you picked poorly, you are not practising it often enough or you are trying too many things too soon.