There are times when the stock market is in a big, beautiful bubble. During those times, it’s difficult to convince anyone to sell, or bet against it. Why sell bitcoin BTCUSD, +5.80% at $10,000, for example, when it might potentially hit $20,000? Why sell the S&P 500 SPX, -0.37% at its all-time high right before Christmas? Are you crazy? Often, there is no hard evidence that a market is in a bubble until after it pops. That is why common sense goes out the window during bubble-euphoria as the market reaches levels that seemed impossible only a few weeks before. Whether the U.S. stock market is now in a bubble or not will be for the history books. Regardless, one strategy that most traders (and investors) should learn is how to buy and sell options. Those who don’t understand options believe it’s “a sucker’s bet.” It definitely is if you don’t know what you are doing.via