Hex-Rays recommends The IDA Pro Book by Chris Eagle to give you the
best insight into working with IDA Pro and the Hex-Rays Decompiler. In
our view, this book is:
It describes all major IDA Pro features in an easy to read format.
Experienced users may be tempted to skip the first few chapters;
resist this temptation and you will discover something new.
It is very difficult to be detailed and precise when describing
such a complex product. Chris does it extremely well.
Handles real world malware, packers, and obfuscated code.
This is not just a collection of recipes or tricks but will give you a
better understanding of the IDA Pro architecture, thus saving you
from unnecessary frustration.