The document discusses key areas of language that are important for critical thinking: word choice, ambiguity, definition, and intensity. It provides examples of how word choice can influence thought and behavior. Ambiguous language can cause confusion and lead to overgeneralization. Definition examines denotative and connotative meaning as well as operational, example-based, negation-based, and etymological definitions. Intensity of language discusses using respectful language without negatively raising emotional levels.