Here are some FREE resources -
Offered in video and text options... Some are older versions, but the concept is the same and they still build a solid foundation to start with.

Intro to LR - an excellent video that covers the package - it's almost 2 hrs long so be prepared for that.

How Lightroom works: Where it keeps your images and presets, and how to back up

LR Catalog FAQ

Loading Images Into Lightroom: Training Tutorial

Adobe Lightroom 5 - Training Videos by Anthony Morganti

Learn Lightroom- Adobe Video Tutorials

Tutorial Video - 10 Tips for Optimizing your photos with LR

Cleaning Up Your Mess in Lightroom


Training from Light Stalking - How to Get Better at Lightroom and Post Production

The Modules of Adobe Lightroom

A Killer Collection of Adobe LightRoom Tutorials

3 Lightroom Tweaks to Get Your Landscape Photographs to Sing

3 Easy Lightroom Adjustments to Add Drama to a Landscape

5 Simple Lightroom Tactics to Improve Almost Any Landscape Photograph

Create Perfect Portraits in Lightroom Using These 6 Classic Retouch Techniques

The Ultimate List of Keyboard Shortcuts for Lightroom with Free PDF file to download...

Hope this helps...