Succeeding as a stock market investor doesn't always require picking individual companies.Some people might think that in order to be successful investors, they have to learn how to pick the best individual stocks for their portfolios. Finding a winning stock early in its growth story can be exciting. However, this isn't the only way to find success in the market.For instance, putting some of your hard-earned savings into the Invesco QQQ Trust (QQQ 0.05%) has also been a winning strategy. If you had investe ...