Practical Cryptography with Go wastes no time in making it's intent clear. The book aims to arm the reader with enough information such that they can use cryptography in their day to day, correctly, safely and with a good level of understanding.
I reckon it does this pretty well, for my money. Note that I am not a cryptographer, and what follows is by no means a review of the crypto itself. I didn't spot anything egregiously incorrect, for what it's worth.