The concept of the focusing illusion suggests that people tend to place too much emphasis on certain factors while ignoring others when evaluating their happiness or well-being. This psychological phenomenon can lead to misleading conclusions about what truly makes people happy. Resources like *The Science of Well-Being* course on Coursera, offered by Yale University's Laurie Santos, provide insights into the nuances of happiness and well-being, making it a valuable educational resource for understanding these concepts in depth.