Thinking skills refer to the mental processes used to make sense of experiences. Better thinking skills help improve learning and prepare one for life challenges. The document outlines basic steps in thinking like identifying problems and evaluating solutions. It discusses tools like parallel thinking and Edward de Bono's Six Thinking Hats model to optimize thinking skills. The document emphasizes that developing thinking skills is a gradual process requiring practice over years. It identifies six stages of critical thinking development from unreflective to master thinking. The definition of intelligence has evolved with technological advances and our understanding of the learning process.