How To Develop Critical Thinking

"Critical thinking is the intellectually disciplined process of actively and skillfully conceptualizing, applying, analyzing, synthesizing, and/or evaluating information gathered from, or generated by, observation, experience, reflection, reasoning, or communication, as a guide to belief and action."

-louisville.edu

In short, critical thinking is the ability to question the information presented to you.

Reinforce your critical thinking abilities with reading...

If you read non-fiction books of similar subjects you will encounter situations where there's contradictions either amongst the authors or with your own experience. You, the reader, will need to think about who's right/wrong and that exercise is what ultimately develops your critical thinking abilities. 

Critical thinking is a lost art because not enough people are reading or being exposed to situations that requires them to think critically. Society suffers when there's not enough critical thinkers.