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It isn’t too late to learn important lessons from the surprising resurgence of American oil and gas. It is also not too late to profit from it.

The surge in energy production has confounded giant oil companies, created billionaires who are emerging as the nation’s new Rockefellers and Gettys, and altered America’s economic and geopolitical outlook.

Just a few years ago, the country seemed destined to rely on imported energy. Today, the U.S. is moving toward energy independence.

The dramatic shift is thanks to a few stubborn Americans who developed improved—and controversial—methods to hydraulically fracture, or frack, shale and other tough rock. They also introduced ways to drill horizontally in challenging, compressed rock.