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You've probably heard of the QQQ. It is a great trading or investment vehicle. When you buy shares of the QQQ, you are getting exposure to Apple, Netflix, Google, Amazon, Facebook, and many other tech (and some non-tech) stocks. If you buy the QQQ and hold it for the long-term, you will be able to profit from the long-term growth of the tech industry. You've probably also heard of indexing. It consists of buying an index (usually using an ETF like the SPY or QQQ), and holding it for the long-term. Indexing is a form of "passive investing." Passive investing refers to any strategy that does not involve a lot of thinking ("which stocks should I buy today?β) or a lot of buying or selling. When you index, you just buy whatever stocks are in the index. You only sell a stock when it gets kicked out of the index. And you only buy a stock when it gets added to the index. Or you just buy the SPY or QQQ, and these index adjustments all get done automatically for you.
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Matthew R. Kratter (A Beginner's Guide to the Stock Market)