Jan: New To WordPress?: Here’s How to Get Started
Feb: Creating and Using Posts, Categories & Tags
Mar: Creating and Using Pages & Templates
Apr: Using Themes
May: Using Plugins
Jun: Creating Child Themes
Jul: UX for Theme Development
Aug: Permalinks & Other Core Settings
Sep: The MySQL Database: Overview & Details
Oct: Blog Design and Layout
Nov: Writing Plugins: All about the API and Resources
Dec: Profit from Documentation & Development