Sensitivity labels are not just visual markings — they are a governance model for classification, protection, containers, access and data handling. This interactive guide helps Microsoft 365 admins design a sensitivity label strategy that covers taxonomy design, file and container labels, encryption, auto-labeling, DLP integration, Copilot readiness and user adoption. Includes a 10-input governance scoring engine, baseline taxonomies, rollout phases, and 16 common labeling mistakes from real tenants.