QGIS is a popular a Free and Open Source Geographic Information System with advanced capabilities. You can find here tutorials and tips that show you how to use it to tackle common GIS problems. QGIS is a powerful medium for mapping, juxtaposing and statistically analysing spatial, temporal data and numerical data.
You may use these tutorials as a self-paced course to learn the software thoroughly. However, each section is fairly independent, so those familiar with QGIS can jump into any section.
![https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/QGIS_logo%2C_2017.svg/1280px-QGIS_logo%2C_2017.svg.png] QGIS official site