In this exercise, learners are required to distinguish the information belong to "primary sources" or "secondary sources". Primary information source are anything created at the time when the incident/event happened. They were created with the intention to record the incident/event. It could be a document, manuscript, autobiography, a recording, a diary, an artifact, and so on. Secondary information source is anything (e.g., documents, records, artifacts, objects, and so on) that discuss, relates, or refers another piece of information existing elsewhere.
In this slide, it introduces different type of resource was created with a particular kind of purpose: to transmit facts, to interpret the findings, to put forward a viewpoint, to let fellow workers know some important idea, and so on.