Such terminology would include primary evidence, secondary evidence, reliable and bias. All candidates need to know what each of these words mean. Primary evidence is evidence that actually comes from the time being studied in the question. The memories of survivors would be primary evidence. Film of the ship leaving harbor would be primary evidence.
Secondary evidence is the opposite of primary.
This is evidence that does not come from the time being studied. Historians frequently produce secondary evidence. Though she used a vast number of primary sources in her research, the actual finished book would have been secondary evidence. Each has its own value. They might exaggerate certain points, their factual recall might simply be poor etc.