This weekend (2017 Nov 17th - 19th), there will be another free weekend on
Code School. All courses will be free during that time.
If you want to get a head start, you can try the first level of a paid course (which will be free). You can also try the handful of entirely free courses they offer.
Courses are organized into convenient to follow paths, such as:
Git:
I thought the paths on Ruby and JavaScript were particularly interesting.