Any word or phrase identifying a cohesive parcel of knowledge that can be applied to significantly govern behavior.

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Concepts tend to be timeless as opposed to facts. One should learn far more concepts than facts, especially in fields where rapid change is the norm. The higher level a concept is, the more timeless and powerful it is. The very best concepts are clear, concise and at the proper level of abstraction.

For example, concepts like principles, mechanisms and inspirational slogans can affect behavior, but principles are a higher level concept. The higher level a concept is, the more powerful it it. Extremely high level concepts are known as abstractions or strategy.

For example "Granite is heavy" is a fact or data, not a concept.

Use concepts to see the essence of anything.