I kind of hate to say it because I'm not a big fan of it, but video content seems to have the widest appeal.

I don't know that you'll ever be able to get to a single absolutely clear method though. People have different learning styles. For example, I prefer reading a book by text, but I just can't absorb an audiobook. Meanwhile I have several friends who can't focus well enough to sit through a dense book and can retain the whole thing through audio.

Anyway, videos check a lot of boxes that other formats miss. For example, so much of our communication relies on non-verbal cues which are missing entirely from books. While an audiobook might capture the tone, you still miss the body language.

Another advantage to videos is that depending on the tutorial, it can be both visual and experiential. A step-by-step video recipe is more accessible for new cooks who might not know what "mix until smooth" actually looks like.

So why don't I like videos? Well, to use the cooking example again, I already know how to cook. I don't actually need step-by-step guides, and usually I just need to refer back to the ingredients or a single step. It can be difficult or time consuming to scroll back through a video and find the exact right spot. My personal peeve is all these tiktok videos that get shared to me showing a recipe, where each ingredient flashes once for a half second, and if I miss it I have to let the whole video loop to find it again.

So anyway for broad appeal and for introduction to a subject, I think videos are probably the most enjoyed format. For a deeper dive or a reference it's got to be text for me.