It’s important to know about cognitive biases for a number of reasons. First, just for yourself. Knowing your cognitive imperfections and imperfections of other people makes you better in making judgements, decision-making, voicing opinion, etc. I know this might not sound like your life goal, but it does bring you closer to understanding reality the way it really is. Second, it helps to understand all ways in which you’re being manipulated as a consumer, because no one uses cognitive biases as effectively as advertisers, politicians, and others that aim to persuade. Third, it shows you the ways to improve your own attempts at selling your products or your ideas.