I recently purchased Dave Dugdale's GH4 tutorial. He bills it as a beginner course. I don't consider myself a beginner and found it well worth the price and time. He does an excellent job of explaining all of the complex menu systems and how to set them up.
Check it out here:
Panasonic GH4 Video Tutorials - Training Course for Shooting DSLR Video (http://www.learningdslrvideo.com/store/gh4_sales.php)