"Critical Thinking" may sound like an obnoxious buzzword from liberal arts schools, but it's actually a useful skill. Critical thinking just means absorbing important information and using that to form a decision or opinion of your own--rather than just spouting off what you hear others say. This doesn't always come naturally to us, but luckily, it's something you can train yourself to do better.
Critical thinking doesn't end. The more knowledge you cultivate, the better you'll become at thinking about it. It's navel gazing in that you're constantly thinking about thinking, but the end result is a brain that automatically forms better arguments, focused ideas, and creative solutions to problems.
Via Gust MEES