There are plenty of resources online to get started and learn GRASS GIS: frommanual pages for each module and addon with examples,wiki pages with applicationsand use cases to beginner and advancedcourses and workshops,videos and presentations for specific topics,jupyter notebookswith different workflows andbooks. There is also aGoogle Scholarprofile that keeps track of scientific publications and applicationsof GRASS GIS in different domains.You may eventry GRASS online to get a feeling of its capabilities!