See the Quick Start page for step-by-step tutorial on basic Kdenlive functionality.
Youtube Video Tutorials
Unfortunately the video tutorials that were indexed at the tutorials secton on kdenlive.org site seem to have lost the links to the actual video. We will try and find these tutorials and list them here.
Basic Introduction to Kdenlive - nixiepixel
An Intro to Video Editing with Kdenlive - ThisWeekInLinuxl
Image and Title Layers Transparency Tutorial - qubodupl/Open Source Bug