Cramer's 'Mad Money' Recap: Disciples of Discipline

This is what really counts and what people should pay attention to, Cramer said.

Cramer said he came up with this rule on June 22, 2005, when he got "caught up" in the idea of a tech rally and picked the two names that most represent tech: Microsoft (MSFT Quote) and Cisco (CSCO Quote). But later Cramer realized that the so-called tech rally was really a gadget rally.

"I fooled myself because Microsoft and Cisco had always been the tech stocks," he said. "It didn't matter that they didn't have any real exposure to the rally, because I was thinking of it as a tech rally, and in a tech rally you buy Microsoft."

It's easy to mistake a rally in an industry for a rally in the sector it belongs to, Cramer said, but if people remember this second rule, they should be able to make a lot more money.

Latin America

He said his next rule is "provisionally true" and though at some time in the future he can see it being revoked, he doesn't believe it will be soon. The rule is that "Latin America is always a trade."

Every so often there's a "huge wave of interest in Latin American stocks," where everyone in the business who owns these stocks believes that Latin America is an "amazing, long-term growth story," Cramer said.