Materials for a QGIS Course

References

QGIS Webite - Main website for the software
QGIS Hub - Share things to reuse in QGIS
QGIS Materials themselves - QGIS Version 3.4x - Official guide for QGIS from the QGIS Community
Spatial Thoughts - Free training materials from a professional GIS training organization
QGIS Tutorials and Tips - Tutorials from the same producer as above
OSGEO.org - The parent organization that provides a framework for open source geospatial projects, including QGIS. QGIS is also built from a few OSGEO projects.
Reusable QGIS things - Something I’m accumulating

Places to ask questions

The QGIS SubReddit -
The official QGIS mailing lists if email is more your speed

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