Berkshire Hathaway (BRK-B, BRK-A) CEO Warren Buffett — also known as the "Oracle of Omaha" — is one of the biggest value investors of today. But what exactly are the central themes of value investing? Wealth host Brad Smith explains the basics of value investing strategies and the metrics in which Wall Street uses to measure and find undervalued stocks. The legendary investment firm released its latest earnings results over the weekend alongside Buffett's annual letter to shareholders. Catch up on how Berkshire Hathaway has been adjusting its investment portfolio in recent months, including the firm's five biggest holdings. To watch more expert insights and analysis on the latest market action, check out more Wealth here. This post was written by Luke Carberry Mogan.