It depends. Often the Indian guy (or equivalent) is giving specific knowledge on how to use a piece of software or library. That’s something the professor cannot and should not be focusing on. Too transitory.

We can think of it like cooking… If you understand emulsification using starch, it unlocks the ability to create many kind of sauces, but it won’t really help you with the specific recipe if Sauce Merchand du Vin. Fundamentals and tutorials are both good info, and the mistakes come from applying them to the wrong situations, or not having enough context to use either