Python

Youtube might actually be okay to getting started. Certainly not my recommendation (!), but it might work. But for absolute beginners it may indeed be better than the official documentation of Python, where they do have a tutorial, but which is explicitly written for people with prior experience in other languages. And as for "the only reliable resource that can teach you the language" I would say that that's not true. Books are great resources. Maybe not always fully up-to-date, but great resources. The official documentation however is the best reference. That is, what you use when you already know the language, but need to look things up.