First is cast and retrieve. Second is under a float. Most of the time bluegill and redears are near the bottom and I don't want to use a float. But when fishing shallow flats less than 6 feet deep I will use a float to gain casting distance and keep the jig above the weeds. Also, in smaller bodies of water at least, Bluegill will often suspend near the surface even out over deep water. It is always worth a few casts with a float out in open water if you aren't having much luck finding them where they normally are.