QGIS is an open-source, professional desktop GIS environment. It can be used to view GIS information, perform analysis, and create maps to display and present data. It supports plug-ins and a number of raster and vector data formats.
User manual - The official QGIS User Guide for version 3.28.
Training manual - a series of modules guiding new users through the capabilities of QGIS with specific tutorials.
A Gentle Introduction to QGIS - a starter's guide to QGIS and GIS systems in general. If the above guides were difficult to follow, then this introduction is recommended.
Understanding GIS Through Sustainable Development Goals by 
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