I'm assuming your brand new to Rails so I would definitely check out "Agile Web Development with Rails 4" (https://pragprog.com/book/rails4/agile-web-development-with-...). It was written by DHH, Sam Ruby, and Dave Thomas. I started reading through this after I did the online tutorial and I have not been disappointed so far. There are some other books they have that seem interesting. I'm thinking of getting "Crafting Rails 4 Applications" by Jose Valim when I'm finished.
I also hear that Michael Hartl has written some great material (https://www.railstutorial.org/), but I haven't read anything by him yet.
I also hear that Michael Hartl has written some great material (https://www.railstutorial.org/), but I haven't read anything by him yet.
Hope this helps and best of luck.