As a new cmake user these two presentations have been essential in getting started with "modern cmake":

[0] http://thetoeb.de/2016/08/30/modern-cmake-presentation/

[1] https://www.slideshare.net/DanielPfeifer1/cmake-48475415

And this blog post also has some good stuff:

[2] https://rix0r.nl/blog/2015/08/13/cmake-guide/

Well, I'm in the middle of writing a book titled "Effective CMake" [1] where I'm going to explain how to use CMake in a nice and modern way and some of the tricks which are not covered by the (very good) documentation.

[1] https://leanpub.com/effective-cmake