QGIS is available for download for Mac, Windows and Linux. No license is required, as it is free and open source.
Online Documentation and Tutorials
Includes the "QGIS Training Manual" (with canned data and exercises, enough for a 5-day workshop!), and the concept-oriented "A Gentle Introduction to GIS"
Lex Berman's "Open Source with QGIS 2.18" tutorial
Great content, see menus in upper right to navigate through different common actions
Also includes excellent installation instructions
Search the U-M Library Catalog for qgis to find books, both electronic and print! Available to UM users only