Usually, the best code to read is something that you already need to understand. So, if there's a library you use at work, for example. Also, for every languag

Usually, the best code to read is something that you already need to understand. So, if there's a library you use at work, for example. Also, for every language there's a really important project written in that language, like SQLite if you want to learn C, or finagle if you want to learn Scala.