Linear thinking is straightforward and follows a direct path to solve problems, while nonlinear thinking considers alternative approaches and hidden meanings. Fuzzy logic allows for ambiguity and dealing with true meanings that are not clearly stated. The document discusses how these different thought processes - linear, nonlinear, and fuzzy logic - are used in everyday life and thinking. The author thinks nonlinearly to plan solutions but linearly to implement them, and uses fuzzy logic to understand true meanings behind ambiguous statements.