For each of the items listed, decide whether they are monthly, quarterly, or yearly, payments, then repeat the monthly amounts in all the columns that apply. For example, monthly payments will go in all 12 columns but quarterly in only in the four columns when payment is due. The next stage is for you to consider what other necessary expenditure will come out of your income every month. These other expenditure items probably do not show up as regular payments in the first stage, though individual payments may. These items may include food, household goods such as detergents, car maintenance, petrol (gasoline), and fares, which are essential to you, and you need to budget for each month.
You will find that there are dozens of different tutorials available online, ranging from books and courses that you can pay for to tutorials and video lessons that can be downloaded for free. Each of these courses is broken down into sections that will address each of the different sections of formula so that you can learn them in groups. This tends to make it much easier to fully grasp the necessary formula for each section before moving on to the next segment.