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Most effective learning comes from doing—applying what you've learned.
However, when the subject is complicated, putting things into practice immediately is often impossible or at least ineffective. A complex subject is like a sack of sand that is too big and heavy to carry. To be able to move the sand, you need to divide it into smaller portions. You should do the same with complex subjects: make them clearer and more tangible.
What are the methods to make the complicated thing easier to work with?
Understanding the basics is sometimes a necessary "step back". Because usually, if a subject is too hard for you it means that you don't have the foundation to understand it.
Elaboration through writing to dock the new information to the existing one.
Spaced repetition or other forms of drilling to transfer the knowledge from the short term to the long term.
All of these things help you build mental representations—i.e., help you internalize the subject—and therefore give you more mental capacity to start working with the concepts.
Once you have the basic understanding—you know the basic WHY—you can proceed to doing.