The document discusses two types of sources for obtaining information: primary and secondary sources. Primary sources are original documents created by people who witnessed or participated in an event, such as diaries, photographs, or artifacts. Secondary sources are created by someone who analyzed or interpreted primary sources, such as textbooks, journal articles, or biographies. The document emphasizes the importance of critically evaluating sources using the CRAAP test to assess the currency, relevance, authority, accuracy, and purpose of the information.