Of course not every single hypofunction of PSE is 11 illuminated in detail, but the most important functions and filters are well explained and you get the knowledge and understanding imparted to test the remaining functions independently and then deploy in meaningful image processing context.
My tip: The video tutorial can be very effective use on a dual-monitor setup. Then you can tutorial and PSE simultaneously run on separate Bidlschirmen. The processing steps are explained in a speed that without having to rush, a parallel reaction in PSE allowed 11, without that long would have to stop the tutorial all nose.
I must say, I had long gone much fun in learning a software, and will now safely in the future resort often times on a video tutorial rather than a book compendium.