There are many different types of bait that can be used for trolling, and the best type of bait to use depends on what kind of fish you are trying to catch. Some common baits used for trolling include: live bait (such as minnows or worms), artificial lures (such as spinners or spoons), and cut bait (pieces of fish flesh).
Live bait is often considered the best type of bait for trolling, as it is the most natural and appealing to fish. Artificial lures can also be effective, especially when they are designed to mimic the appearance and/or movement of real prey. Cut bait is sometimes used when fishing for larger predators, such as trout or salmon, as these fish are more likely to strike at a large piece of food.
Experimentation is often key when it comes to finding the best bait for trolling, as different fish species have different preferences. It can also be helpful to talk to local fishermen or experts at your local tackle shop, as they will likely have valuable advice based on their own experiences.