You don’t have to train your abs every day especially if you are also doing core stimulating exercises like squats, push-ups, deadlifts, and standing military presses in other workouts or on other days.
The core muscles need post-workout recovery time like any other muscle group and while the abs have a higher degree of slow-twitch muscle fibers giving them a higher endurance threshold, you will still get the best results with proper recovery between workouts.
Ab exercises do not melt belly fat, no matter how many of them you do. There is also no way to “spot reduce” body fat. You can reduce body fat overall by following a healthy diet and exercise regimen.
That 6 pack will not be visible until you reduce your body fat. Getting “cut” means lowering body fat levels to the single digits with fat burning exercises and by expending more calories than you eat every day.