English version

that’s/it’s Psychology 101/Marketing 101 etc

From Longman Dictionary of Contemporary Englishthat’s/it’s Psychology 101/Marketing 101 etcthat’s/it’s Psychology 101/Marketing 101 etcinformal used to say that a piece of knowledge relating to something is very simple and basic If you’re with a girl, don’t stare at other girls: that’s Dating 101. 101
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