What is the difference between the Ruby Foundations course and the Ruby Basics track?

Hi, Brandon Keene , you probably won't find Jason here in the forum, so allow me to answer your questions the best I can.

Basically the series of courses included in the Ruby Track was produced as a replacement for Ruby Foundation,

The difference here is that the Ruby Track courses made use of Treehouse's new workspace as teaching medium, on top of that, they use Ruby 2.x; Ruby Foundation, being an old course, was taught using version 1.9.x, whose support has ended 4 days ago https://www.ruby-lang.org/en/news/2015/02/23/support-for-ruby-1-9-3-has-ended/.

Now, to your 2nd question, the courses in the Ruby Track are meant to be introduction to Ruby basics for people who pretty much has no prior programming experience. If you're a somewhat experienced Ruby coder, those courses probably won't teach you anything you don't already know.

For in-depth coverage of Ruby, I suggest the pickaxe book and Effective Ruby; If you really wanna learn the internals of Ruby, then you wouldn't wanna miss this book Ruby Under a Microscope.