Sometimes when we learn something new, progress happens slowly and quietly in the background. Sometimes we hit learning plateaus. Back in college, I remember getting really frustrated with my learning progress. Sometimes my learning was fast and furious. I was on fire. Other times, it felt like learning was very painful and slow.
If you want to learn any subject well and to create ideas beyond those that have existed before, return to the basics repeatedly. In the book, The 5 Elements of Effective Thinking, Edward B. Burger and Michael Starbird share a simple technique to learn anything better, by mastering the fundamentals and going deeper in your understanding.