- One recent highlight are 'MOOC'-style online courses: http://foss4geo.org/
- Start with https://canvas.instructure.com/enroll/LA4DR9
- There is an extensive training manual: http://manual.linfiniti.com/en/index.html
- With video tutorial support: http://qgis-tutorials.mangomap.com/post/79334660226/qgis-video-tutorials-module-1-the-interface
- And of course documentation: http://www.qgis.org/en/docs/index.html
- Plus the invaluable book by Anita Graser: http://www.packtpub.com/learning-qgis-2-0-to-create-maps-and-perform-geoprocessing-tasks/book
- For sure you will find summer schools, conferences, trainings etc as well!
