Casting a fly line, Roll Cast and Overhead Cast, Fly-Fishing Basics. Learn to overhead cast well. The overhead fly cast can be broken down into two main phases, the back cast and the front cast. Overhead cast, fly fishing instruction, describes how to make the cast Probably the most common casting technique, although often performed incorrectly. Learn how to master the most basic cast, the overhead cast. This is the easiest cast to do. Overhead Cast. How it works: How flyfishing works. Starting out: Assembling the tackle.