In order to help investors become better at navigating the stock market, Jim Cramer revealed some of the biggest mistakes he has made in over 30 years of investing.
"Frankly, there are so many mistakes here that it might take a bit to explain them all," the "Mad Money" host said.
He learned that when it comes to investing in commodity stocks, investors must know that it doesn't matter which ones they pick — like going for a better balance sheet or higher growth — if the underlying commodity is hit. If that happens, they will all go lower.
Cramer thought he could avoid getting hurt by taking on a high-growth deep-value strategy, by only buying the highest quality companies for his charitable trust. He bought EOG Resources and Marathon Oil, and was wrong on both accounts.
Though EOG had the best properties, no one cared. Oil stocks all traded together, and almost every company wasn't able to cut spending fast enough to beat the declining price of crude.
"Don't think you can outrun a commodity grim reaper, even with a derivative situation like a master limited partnership," Cramer said.