I seem to be distracted from reading "ASP.NET Core 2 and Angular 5" by Valerio De Sanctis as my life gets busy.

Some notes from the last few pages I have read:

1. material2 is really just another name for Angular Materials.
2. Foundation, Pure, Materialize, UIKit, and Skeleton are Bootstrap rivals.
3. Web Compiler by Mads Kristensen is a Visual Studio plugin for either LESS or Sass while CompileSass by Same Rueby just compiles Sass and uses LibSass to do so which beyond Visual Studio and CompileSass compiles Sass for many languages including a language called Crystal per this which I had not heard of before this morning.
4. Guards in LESS prevent a mixin from ever being evaluated if a condition is not met.
5. You may have loops in LESS. You may hand a number to one of these and then have it n number of times shrink or expand a div an n multiple of 10px or such.