What are the types of sources and credibility?

Sources can be categorized into primary, secondary, and tertiary types. Primary sources include original documents or firsthand accounts, secondary sources analyze or interpret primary materials, and tertiary sources compile and summarize information from primary and secondary sources. Credibility is assessed based on factors like the author's expertise, publication reputation, and the presence of citations or references that support the information presented. Reliable sources typically have rigorous editorial standards and are peer-reviewed in academic contexts.