I'm am considering revisiting RoR for a potential job and hoping to find some (preferably free) resources to get up to speed as quickly as possible. Beginner materials tend to turn me off due to spending much of their time focusing on basics that I'm already more than comfortable with.
I already have a couple of older but solid Ruby/Rails books (v2 & 4 respectively) which I plan on reviewing, but I would also like to get caught up on the latest versions and best practices. I prefer denser materials (in depth with minimal fluff).
Do you guys have recommendations that could help me out? Any and all advice will be greatly appreciated.