There’s a lot of confusion and disagreement about what makes for a RESTful design.
The REST API Design Handbook will help you cut through the chatter and get building solid and sensible APIs, fast. It’s only a few dollars from Amazon if you own a Kindle, and if you don’t - well, there’s always the free Kindle apps. You can breeze through this book in about an hour, but you’ll be applying it’s lessons for years to come. Good value.