The Art of Thinking Clearly by Rolf Dobelli is a book about how people make mistakes in their thinking without realizing it. The author explains that humans are not as rational as they believe. Even intelligent people fall into predictable mental traps that affect their decisions in daily life.

The book focuses on cognitive biases, which are systematic errors in thinking. These biases influence how people judge situations, make choices, and interpret information. Dobelli shows that the human brain prefers quick and comfortable conclusions instead of accurate ones, which often leads to poor decisions.

One of the most common mistakes discussed is confirmation bias. People tend to search for information that supports their existing beliefs and ignore anything that challenges them. This creates a false sense of certainty and prevents learning or improvement.

Another important concept is survivorship bias. People often study only successful individuals or outcomes while ignoring the many failures that existed under the same conditions. This gives a misleading picture of reality and success.

The book also explains loss aversion, which means that people fear losing more than they value gaining. Because of this fear, individuals often avoid change, stay in unhealthy situations, or make overly cautious decisions.

Dobelli discusses social proof, where people copy the behavior of others instead of thinking independently. Many assume that if a large number of people believe something, it must be true, even when there is no evidence.

Overconfidence is another major thinking error. People frequently overestimate their knowledge, abilities, and control over future events. This leads to risky decisions and disappointment.

The author argues that clear thinking does not mean becoming perfectly logical. Instead, it means recognizing these mental traps and actively avoiding them. The goal is to reduce foolish decisions rather than chase perfect intelligence.

In conclusion, the book teaches that avoiding obvious thinking errors can significantly improve decision-making. Clear thinking leads to a more intentional, realistic, and balanced life.