PANDAS and GEOPANDAS! Codecademy's python resources are excellent, and have helped me learn a lot. However, they seem focused on web programming, to the exclusion of data science. I use python mainly for data science, and with the great new(ish) tools emerging in the python world (pandas library, etc), a course on this would be great, and would convince me to keep my pro subscription for a lot longer. It would be great to see some stuff that helped you learn open source tools too, like Jupyter (iPython notebooks).