The book starts with a brief history of hexcrawls to show why people have and still like them. Then a section on if hexcrawls are right for you. Assuming they are, the last section outlines the main steps of creating a hexcrawl

If you're thinking about a hexcrawl campaign and are on the fence, start here. This will either outline why a hexcrawl isn't for you or show you the road the rest of the series seeks to pave toward creating one. Either way you should feel more confident about your choice

Not much by way of mechanics but thats what the other books are for. I really like the series and this is a good intro