Financial decisions can be influenced by cognitive biases that affect the way investors reason, evaluate, remember, and make decisions. Investors are often inundated with an overwhelming amount of data, which can lead to a lack of diversity in input and overconfidence. Some of the common cognitive biases include confirmation bias, anchoring, familiarity bias, endowment effect, overconfidence bias, and hindsight bias. To manage these biases, investors should stick to their time horizon, strategic asset allocation, and manage extreme emotions during market volatility. They should also seek diverse and high-quality insights to enhance their decision-making capabilities. Investment advisers play a crucial role in providing appropriate advice by considering investors’ financial goals, risk tolerance, culture, and aspects of their personality. They should encourage investors to not overemphasize what’s familiar and recognize the importance of cognitive diversity in decision-making. Overall, a decision-making approach that embraces diverse views and corrects biases is essential for achieving good investment outcomes.