When I began studying physics I felt like a clueless novice. All those equations looked like chicken-scratch on paper. And, "What's the difference between kinetic and potential energy?" And there were so many concepts to understand - forces, masses, fields, charges, and particles. And differential equations seemed incomprehensible. Now, after a few decades I've mastered most all of that. Yet, when I try to grasp the real basics, like "What is space-time?", "How does superposition lead to a single macroscopic universe?", "What is the Higgs field?", "How did this universe 'start'?", "What exactly is mass?", then I realize I'm really back at novice again. I know almost nothing.