I wrote this tutorial manual and accompanying material for a day-long, introductory GIS workshop that I taught at Baruch College CUNY for many years. This is the most recent version, free for classroom use and self-directed learning under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Download the data file, unzip it, and then follow the exercises in the manual. This tutorial was written for QGIS 3.10. It’s best to stick with this version if you are new to GIS and are going to use this manual as your introduction.
For QGIS 3.10 A Coruna (Long Term Release)
Introduction to GIS Using Open Source Software
10th edition (April 2020)