Identify two critical thinking skills used by historians

Number 1: Who, what, where, when, and why!

Number 2: Is this a primary evidence or a secondary evidence?

Contextualization; Continuity and change over time; Causation; Synthesis; Argumentation. that is what google says. What my teacher told me: Understand cause and effect, Predict consequence or results, Decide weather something is a fact or opinion, Draw inferences and conclusions, and making comparisons.