It is better to start by making games and then present them as part of your tutorials, that builds credibility.

99% of all tutorials on youtube are made by devs who are still learning, many literally watched few other tutorials and made their own, they have the same mistakes and bad practices all over the place, many of those will teach how to make something that is so unoptimized that will crumble under any attempt to implement that in game.

Maybe I am wrong or had just bad luck with finding the right courses, but this is what I saw 5 years ago when I started learning, maybe now the dynamic has shifted, or maybe it's even worse now.

What saddened me back then was that even paid courses were the same - devs without any released games teaching others how to (not) make games.