Guide for conducting systematic, scoping, and narrative literature reviews. Covers PRISMA and PRISMA-ScR protocols, structured search strategy design (Boolean operators, MeSH terms), database selection (PubMed, Scopus, Web of Science, Embase), title/abstract/full-text screening, data extraction templates, evidence synthesis (narrative, meta-analysis, thematic), and reporting standards. Use when planning or executing a formal literature review.