Steelhead are an anadromous strain of rainbow trout. That is, they spend most of there life in the ocean or in the Great Lakes. Steelhead and rainbow trout look different, grow differently, and one heads off to sea while the other never leaves home. The definition of a steelhead is a rainbow...
The freshwater form is called rainbow trout or redband trout, based on the broad red band along their sides. The easiest way to put it is rainbow trout is the species, there are six different subspecies one of which is the redband.
The most important aspect is the way you clean the trout. I butterfly the trout so that the meat stays as one piece, held together by the skin. It is really pretty easy. A little practice and you will soon be cleaning trout with ease. I have some rainbow trout I am about to cut up so that should...