Kathy Furgang & Christopher Harris 
Build Your Debugging Skills [PDF ebook] 

A single error in a line of code can cause a computer program to go haywire or stop working entirely. Luckily coding has a process for dealing with errors: debugging. Debugging consists of finding and fixing errors in code. You don’t have to work as a coder to develop your debugging skills, though. The simple activities in this book help readers develop their logic skills and an eagle eye for spotting errors, both of which are indispensible in coding and helpful in many other areas as well.