QGIS is an open source option for GIS software. There are many benefits to using QGIS including:
LinkedIn Learning: Learning QGIS
A 3-hour video tutorial introducing users to QGIS (Duke users only). Uses version 3.8.3 from October, 2019. Sign in using a duke.edu email address and it will route you to Shibboleth for authentication as a Duke user.
User Guides (online documentation), Training Manuals (tutorials), and A Gentle Introduction to GIS (overview of GIS principles and terminology). Should be updated to the most recent stable version of QGIS.
SpatialThoughts.com Learning Paths
Links to learning resources such as tutorials, online courses, and videos. Uses QGIS version 3
MMQGIS plugin package
Documentation on the useful plugins that come in this package. The package can be installed from the Plugins ... Manage and Install Plugins... menu in QGIS. Turning it on will add an MMQGIS menu to the interface.