Articles appropriate for this encyclopedia, cite verifiable claims from reliable sources (in proportion), without presenting our own claims.

This is an information page. It is not one of Wikipedia's policies or guidelines; rather, its purpose is to explain certain aspects of Wikipedia's norms, customs, technicalities, or practices. It may reflect differing levels of consensus and vetting.

Shortcut WP:NUTSHELL

Claims should come from published sources that can be verified by other Wikipedia editors.

Verifiable claims should be based on references released by established experts and/or publishers with editorial oversight that have a reputation for fact-checking and accuracy.

Citing verifiable reliable sources is necessary for editors to verify the claims and assess the reliability of the references.

Wikipedia articles should present the claims and opinions appearing in the published body of reliable sources, fairly, proportionately, and as far as possible without editorial bias.

Claims must be verifiable in reliable references; consequently, editors may not insert their opinion or analysis of a subject into Wikipedia articles, explicitly or through presentation.

• Wikipedia:List of policies#Content
• Core content policies - discusses the origins of Wikipedia's content policies.