QGIS courses/tutorials

 
Here you can find QGIS official training manual. There are also numerous of other good training resources listed below:

 
QGIS official training manual

GeoAcademy Open GIS​

QGIS in under 10 minutes: 01 - Open and view data (video)​

QGIS in under 10 minutes: 06 - Import data from spreadsheet ​(LibreOffice and Excel) (video)

QGIS in under 10 minutes: 14 - Working with WMS data (video)​