It means questioning and analyzing information carefully before coming to a conclusion, according to general principles of rationality. For example, if you read someone on reddit arguing that ice cream causes people to turn evil because murder rates get higher whenever ice cream sales go up, a critical thinker would 1) verify that that information is even true in the first place, and 2) keep in mind that correlation does not equal causation and try to think of any alternate explanations for why both of those things could go up at the same time (e.g., maybe people are both more likely to commit murders and more likely to buy ice cream when the weather is warmer).
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