This document summarizes 12 key things to know about Oracle WebLogic Server 12c. It discusses the new lightweight installer, per domain node manager, server templates, dynamic clusters, unified management APIs, Java Mission Control monitoring, built-in WLDF modules, RESTful management APIs, Java EE 7 support, new Maven goals, and using WebLogic with Docker containers. The presentation provides an overview of new and updated features in WebLogic 12c and highlights reasons to upgrade from previous versions.