Like with most muscle groups, there are scores of chest exercises you can choose from but only a small handful are really necessary.
In fact, the list of the best chest exercises is quite small:
Barbell Bench Press
Flat Press
Incline Press
Close-Grip Press
Reverse-Grip Press
Dumbbell Bench Press
Flat Press
Incline Press
These exercises are all you need to build an impressive chest. Period.
Forget cable work, dumbbell flyes, push-up variations, machines, and every other type of chest exercise out there. They are not nearly as effective as the above three core, foundation-building lifts.