The average stock market return is historically 10%, although it changes from year to year. Returns can vary, but buy and hold is the most likely to yield long-term results.

Variability measures how widely a set of values is distributed around their mean. Here's how to measure variability and how investors use it to choose assets.

A buy-and-hold investing strategy can lead to significant long-term returns. Learn more about the Best stocks to buy and hold forever and how to get started using a buy-and-hold investing strategy.