The world around geographical information systems is undoubtedly fascinating and increasingly required by the world of work. The problem is how to become an expert in a short time! Will it be sufficient to learn QGIS or ArcGIS Pro? Or will only Google Maps suffice? Will you have to enroll in a university course? Take a paid online course? None of these! Compared to twenty years ago, when ESRI was the undisputed master in GIS and social networks had not overwhelmingly entered our daily life, it was rather complicated to find useful information to solve our problems.