If you know nothing, or just a very little, about Lean, here is a five part, easy-to-follow video series that will introduce you to all the major concepts and elements. The whole series takes just under 50 minutes to watch.
The first video on the history of lean is optional. stands alone and can be watched any time. I do recommend watching the others in sequence as they build on each other.
The full series consists of:
Brief History of Lean
What is Lean?
What is Waste?
What is Heijunka and Value Stream Mapping?
What is Kaizen?