Reassess your chess 4th edition -Silman

You are correct Spongey.  But based on my experience with the book, I would not recommend it to anyone below 1500, and even that might be stretching it a bit.  I think better for 1600+.....I find it an arduous read...but if you can get through it, the rewards will follow...

I learned the value of a library at a young age; you will eventually grow to understand what is written in the “harder” books. Whether the material will be valuable/useful or not, that will depend on you. The hard part is the work that it takes to understand the material, just like building up one’s vocabulary - there are no shortcuts for this.

What I hate the most is realizing that a clear and well-written book has already been published addressing a subject that I struggled with, and it was accessible to me the whole time. I literally exclaim, “I could have used this back when <insert dark times here>!”