sbt in Action, first and foremost, teaches you how to build Scala projects effectively. It introduces the sbt tool with a simple project that establishes the fundamentals of running commands and tasks. Next, it shows you how to use the peripheral libraries in sbt to make common tasks simpler. Along the way, you'll work through real projects that demonstrate how to build and deploy your projects regardless of development methodology or process.
Scala is a powerful JVM language that blends the functional and OO programming models. You'll have no trouble getting introductions to Scala in books or online, but it's hard to find great examples and insights from experienced practitioners. You'll find them in Scala in Depth. There's little heavy-handed theory here—just dozens of crisp, practical techniques for coding in Scala.