Wikipedia:Content policies and guidelines in a nutshell

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

[[Wikipedia:Verifiability]]

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

[[Wikipedia:Reliable sources]]

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.

[[Wikipedia:Citing sources]]

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

[[Wikipedia:Neutral point of view]]

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.

[[Wikipedia:No original research]]

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.