Book suggestions for teaching science at advanced level
I would say that it isn't necessarily good to focus too much on whether you &quot;get difficult calculations or complex explanations of conceptually difficult concepts done as if it is a piece of cake&quot;. Instead, look at how students learn. Some difficulties are actually desirable for increasing learning and a presentation that is too smooth can backfire by making things look too easy. Not that this is an excuse for poorly prepared or executed instruction, of course.
Since you ask for a book recommendation, you might want to consult &quot;Teaching and Learning STEM: A Practical Guide&quot; by Felder &amp; Brent. It contains many tips on getting students more actively involved in the learning process.