This document discusses primary and secondary sources and questions to ask when evaluating sources. Primary sources are first-hand accounts like diaries, letters, photos created during the event, which provide direct evidence but may be biased. Secondary sources are analyses created after the event from multiple primary sources, trying to be less biased, but are still often biased. When evaluating any source, one should consider when it was created, the author's attitude and potential biases, whether all facts are included, if it aims to persuade, and whether other sources corroborate it to determine how much the information can be trusted.