This document provides an overview of key concepts for studying history, including: - The importance of asking questions like what, who, where, when, how and why during historical research. - The different types of sources used in history, including primary sources created during or near the time being studied, secondary sources which analyze primary sources, and tertiary sources which are further removed. - Guidelines for evaluating the reliability and credibility of sources, such as considering factors like whether sources agree, proximity to events, corroboration, and potential for bias. The document outlines steps to take if sources contradict each other.