What did Adam Smith defend in his book Wealth of nations?

In the Wealth of Nations, Smith advocates capitalist thought. Among his ideas was the "invisible hand" theory, which states that the economy should flow on its own and be out of the grip of the wealthy factory owners. Smith also states that a nation will operate ideally if it can obtain as much currency as possible, therefore having the most wealth out of all nations worldwide. However, in modern times, we do realize this results in disastrous inflation.