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CNBC’s Jim Cramer suggested research can give investors an edge, stressing that it’s necessary to gain knowledge about a stock before adding it to one’s portfolio.

“You should never buy anything that you don’t have some personal knowledge about, unless the stock in question belongs to a well-known, best-of-breed operator,” Cramer said. “But for the vast majority of stocks, don’t even think about buying them unless you actually know something about the underlying company.”

When Cramer first started trading, it was harder to access corporate information than it is now, which made investing more difficult, he said. But at the same time, he continued, it was easier to gain an edge by finding data that was “buried in places that no one would ever look.”

Most material is on the internet, Cramer said, and investors can use search engines and chatbots to access any relevant information.