New Viewport Units - Ahmad Shadeed
New Viewport Units | 12 Days of Web
Review newly available units to manage space within the large, small, and dynamic viewport spaces.
Viewport Unit Based Typography
A handy article on Vertical Rhythm and Modular Scale with Viewport Units.
Media Queries for Standard Devices
This page lists a ton of different devices and media queries that would specifically target that device. That's probably not generally a great practice, but it is helpful to know what the dimensions for all these devices are in a CSS context.