Can get results by providing simple values like in case of footing, you have to enter the footing size and reinforcement details, you will get all the reinforcement details like cutting length, number of bars that go both in x - direction & y - direction.
Similarly, you have to give details of the slab, then you will get the appropriate results. The results are based on pass calculation and having IS Code as reference. For learning How you can make the calculations and the rules of Bar Bending Schedules, you can learn through Civil Guruji.