What prevented the Persians from defeating Greece? Why did the Persians lose?

It’s all about strategy. At first it was like this: the Persians decided to go through the Thermopylae Gorge, but the Spartans, who gave the Persians a battle, blocked their way. This maneuver made it possible to delay the advance of the Persians, and also gave time for the commander Themistocles. What he did? He took the population of Athens to the islands and gave battle to the Persians, or rather, the Persian fleet that entered the Gulf of Salamis. It was difficult for Persian ships to maneuver in such conditions, so their fleet was utterly defeated by Greek light ships. Those Persian troops that were on land, without support from the sea, were simply helpless. With a similar strategy, the Greeks defeated the Persians.