First steps with Tableau

I wanted to try out Tableau, and chose to start with some data of my own. 

After quite a lot of trial and error, I ended up with this:

Learn About Tableau

Pretty, though not interactive as I thought it might have been.
I wonder whether I'm much further on than I was when I was using R to explore the same data, and got this:

In some ways, I prefer the step graph in R, but I'll come back to that.