I love using food in training.
Close up or at a distance, it’s dead easy to deliver as a reward and dogs generally love it and want to work for it.
Some dogs will do cartwheels for cheerios (can anyone say “Labrador Retriever”)?
Food can be used not only as the perfect reinforcement for good behaviour, but it can also be used as a lure. Luring with food, i.e. getting a dog to target a food treat with his nose, can be used to elicit an amazing array of behaviours.