When you comprehend the information you've learned, or knowledge, you understand it. When you understand the knowledge and learn to apply it to decision-making, you gain wisdom.

What is the difference between understanding and knowledge?

The word knowledge refers to skills/information/facts that one gathers through education or experience. The word understanding refers to the ability of someone to understand something.

What comes first understanding knowledge or wisdom?

There's no chicken-egg scenario here: knowledge always comes first. Wisdom is built upon knowledge. That means you can be both wise and knowledgeable, but you can't be wise without being knowledgeable. And just because you're knowledgeable doesn't mean you're wise … even though your teenager may feel differently.