QGIS is a free user friendly open source desktop GIS software package used to create maps and analyze geospatial data. The application supports various formats such as vector, database and raster formats. One major advantage of QGIS is that it allows users to import open street map files that are also gaining popularity every day.
The QGIS 2 Cookbook is a large collection of techniques (simple through to advanced) that are used in everyday geomatics work, with detailed process to help accomplish those tasks using QGIS. By the time you are finished with this book, you should have all the necessary knowledge to better handle and visualize geospatial data, with QGIS.