Quick shout-out about free scala resources compiled together under this link https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md#scala. There are many other resources related to other programming languages and technical topics.
Especially I want to highlight http://aperiodic.net/phil/scala/s-99/ which I would like to go through and make a series of posts about my progress.