We all know that it’s unproductive to think, “If only I’d bought here or sold there.” Or “If only I picked up Network Appliance before it bounced back instead of selling it into its bottom” – if only, if only, if only. These two words have no place anywhere near your portfolio, Cramer says.

People don’t spend enough time talking about the psychology of investing. The pressure of owning stocks and having to make decisions about whether to buy or sell them is intense. It’s scary. Being an investor is emotionally brutal, but very few people ever talk about that side of stocks. Oh, they’ll talk about earnings and expectations and comparisons – all the rational stuff – but none of that matters if you can’t get your head under control.