You're absolutely out of your mind if you think a player is going to learn better from a youtuber than by experimenting on their own
I actually couldn't get into EU4 for a good while - I kept being overwhelmed with all the numbers, controls, sliders, I had no idea what is connected with what, what affects what, etc. Whenever I started playing a game, regardless of which country I picked, I had the feeling that I am just holding on while the game drags me down the timeline without me really knowing what's going on, reacting to events without understanding the consequences, and in general not having a good time. All that after hundreds of hours in CK2, with several succesful campaigns in that game, so it wasn't like various Paradoxian game concepts were alien to me.
What helped me get past that initial "a-ha!" hurdle was watching one or two youtube tutorials. They explained some basics about how various aspects and mechanisms of an EU4 country fit together, which numbers affects which other numbers and how, they even opened my eyes to certain UI controls that I did not even know were clickable (EU4 has some stupid and unintuitive UI design choices in certain places). I remember one of them was a video starting as Castile, while the other one, focused on how trade system works, was played as Venice, I think.
Of course, these videos did not explain all the subtle details, but it was enough to get me started, and feel like I am starting to be in control of my country. And from there, I was able to dig deeper and deeper into the game, looking up stuff on wiki as needed, understanding what to focus on, learning to read how the modifiers add up in various tooltip popups, etc.
Long-time players underestimate the initial barrier a new player has, and how important "foot in the door" can watching someone more experienced be.
Incidentally (back on topic of this thread), I finished my firsts full playthrough as Ottomans, after first abandoning the game as Castille. Not even because Ottomans game is easier, but they seemed to have much more events and overall dynamic gameplay than Castille, where I felt that I was only waiting for certain number to reach value where I could click a button and wait for another number that I needed to grow, with nothing to break up the monotony.
I did not fare remarkably well on that first Ottomans game, I barely ate maybe one fifth of Hungary, was slapped harshly a few times by European alliances, didn't even get close to India on eastern end, and only pushed Mamluks down past northern Egypt by late game. But I had fun, for the first time in EU4.
Also, I remember that in that game I finished the Suez canal just so-so before the end date, yay!
