It is nice to be able to reward your cat as often as possible. Treats are a nice way to reward them for good behavior. Cats like treats, just as people do. They can actually learn to recognize the sound of the treat bag. I would recommend giving treats in moderation. Treats are also good to try and teach cats new tricks.
Cat treats come in many different shapes, sizes and consistencies. It is best when buying new treats to buy a small bag or box because your cat may not like that certain type or brand. Some cats can be very picky. And then again, there are some cats that will eat just about anything you give it.
Also it is not a not a good idea to give a cat too many treats, as it will ruin their appetite for the food that has the proper nutrition for them. It is also a good idea to look at the ingredients on the package.