https://www.fool.com/investing/2016/09/04/3-pieces
Post# of 82672
Excerpt: Item 3 (partial)
3. Build your positions over time
Dollar-cost averaging , a favorite practice of Buffett's mentor Benjamin Graham, means investing a set dollar amount in the same investment at fixed intervals over time. Basically, this leads you to buy more shares when prices are low and fewer while prices are high. Buffett has said many times that the best way for the majority of people to invest is to dollar-cost average into a low-cost S&P 500 mutual fund. While I prefer buying individual stocks, dollar-cost averaging works no matter what type of investment you're looking at.