What are the key takeaways from “The "Trick" that Compilers Use for Long Division - Computerphile” on Computerphile?

What is this episode about?

Computers process addition and multiplication in a single clock cycle, but division is computationally expensive, requiring dozens of steps. To optimize performance, compilers replace division by constants with a clever mathematical shortcut: multiplying by a specific fraction and then shifting the bits, effectively bypassing the slow division hardware entirely.