People are willing to accept an opinion that is accepted by others without stopping to consider whether there are reasons to support that opinion. The so-called critical thinking is reasonable and reflective thinking that improves secular standard thinking. Critical thinking is complex in theory, but it is not difficult to implement. It only requires people to pay attention to their own thinking processes and constantly reflect and adjust them. This book leads readers to understand critical thinking from multiple aspects such as growth, emotions, communication, life, workplace, management, sales and negotiation, etc., Allowing readers to understand how to carry out critical thinking in various situations, change their mindset, learn to think independently, and make smarter decisions.