How to Manage all your photos with Lightroom. Learn the complete Lightroom workflow in this series of free video tutorials.
Advanced raw processing using Lightroom and Camera Raw. - chapter excerpt from The Digital Negative.
Additional Resources (Third-party paid courses)
Multi-Catalog Workflow with Lightroom 5 (Peter Krogh)
Lightroom video courses and blog (George Jardine)
Lightroom 5: The Fundamentals & Beyond (Laura Shoe)
Lightroom books and video training (Peachpit Press)
Photography and Lightroom training courses (Kelby Training)
Learning Adobe Photoshop Lightroom (InfiniteSkills)