René Reimann and Birgit Olzem explain competent and understandable for anyone to get started in Wordpress. Advanced users can safely skip the first chapters. Which in my opinion this is not only a "comprehensive training" is, but everyone can abgucken one or other useful plugin and use them on his own website.
For several years, we now use WordPress for our corporate website. And I thought that I already speak the WordPress almost to perfection. We were able, despite the good prior knowledge of this video tutorial benefit as well as all other topics than just create Web pages are explained as well as chapter "Optimization for Mobile Devices" "SEO" and "right".
So a clear recommendation from us / me for this tutorial!