The Luminous Landscape New User’s Introduction to Lightroom 4, click the videos tab on the LuLa home screen. Basics haven’t changed a lot from 4 to 5, only $20.
After that, may want to also watch Luminous Landscape’s Advanced Guide to Lightroom 5
LuLa’s videos are comprehensive and the way they are presented seems to be more watchable, not sure what I mean by that, other than they don’t put me to sleep like most videos which tend to be dry and monotonous (this from someone who as done several videos, most of which are dry and monotonous).
There’s many other resources out there, some free, others not.
Julianne Kost’s videos, are well done, and pretty short, each one focusing on a different topic. Often they are more about “what’s new”, but sometimes that helps.