Map school: a free introduction to geo

This is a great starting point to mapping

I've always found coordinate systems both extremely challenging and fascinating - like how longitude and latitude isn't the same across the world according due to different models of the earth.

Have you got any plans to add a more extensive introduction to geodesy?

For those with a preference for Coursera type of learning, there's a course coming up in April that will cover much of the same material — https://www.coursera.org/course/maps