Open source geographic information system
Pick one of the two following topics:
Pick one of the topics, install the software and go through one of the linked (text or video) tutorials. It is up to you how much do you want to do, but at the end, you should be comfortable with using QGIS or GRASS GIS for basic geospatial tasks.
If you already know QGIS or GRASS GIS, you may want skip the most basic parts of the tutorials and dedicate the time to exploring features you don't know.
You can share some of the things you learned on the message board if you want.
There is an Optional Assignment in the GRASS GIS topic which you can try.