To help get into 3d a bit more, I'm recreating my map of France in Cinema4d. There's a lot of assets contained in that map, so I think it will provide a lot of opportunity to learn more about the standard features. I find I remember much more easily the techniques I learn by solving problems of my own creation, rather than following tutorials.
Here's the start so far. Laid out landscape, created mountains, hills, and a few trees. Then I spent a lot of time tweaking the textures. Eventually, I moved on to the rough model of Paris.