I would recommend you buy these books. I was recently reccomended them, and I bought them a few weeks back. They are really good, straight to the point, and explain everything in great detail. Sometimes it explains in to much detail, but its still a great set.
I would also recommend you look through a topic I recently made,I got some fairly good answers on where to start.
Also, make sure to check out learnable, there are lots of great courses and books there to help you.
Hope this helps!