A lot of information on the subject of deductions is available online, but for many of us the information may be difficult to understand, and remembering it, is next to impossible. Hence I have tried to classify and highlight these deductions in a perspective that will not only help us understand them better, but to a certain degree, also help us remember them. For the sake of simplicity, I am not detailing all the conditions and scenarios, but will make sure that you get the point and know that there is a possibility of deduction.