My Kindle has been unused for a while, and I can't resist the temptation of printed books. When I read, I like to jot down my current thoughts in the books, so my house is now filled with printed books...
These days, I jot down my thoughts on paper - not in the books themselves (when I was teaching, things were a bit different).
I tried to learn how to cook on YouTube, but the food I cooked never turned out the same as what they did.
One of the things that it takes you (one) some time to realise is that whole question of calculating time when cooking.
In my experience, both books (cook books) and You Tube videos completely underestimate how long something will take to do: You know, those lying recipes, - even the ones written out on YouTube - which blithely and glibly state that "prep: 15 minutes" when, in actual fact, it is closer to 30 or 40 minutes.
Likewise, know your oven: Your oven will not necessarily (unless it is brand new) conform to the time frames sketched in such programmes: Nowadays, I use their time frames as rough guidelines (unless I am really familiar with a dish, in which case I will know myself how long it is likely to take to prepare it), rather than a set of cast iron instructions which are intended to be obeyed literally.
The point is, many of those who cook online (or, write cook-books), are professionals, or semi-professionals. We are not. At best, some of us are pretty good amateur chefs.