Make a list of all the things you use, be it energy, water, clothing, household utensils. Your food and your pet if you have, and then seek to know the price of all these things. You write down in the paper and then organize the list:
example:
Energy: $4/month ( you separate energy money )
Water: $5/month ( you separate the water money )
clothing: $35 (you separate money from clothing )
After you organize the list you do the total calculations. That way you have an average of how much money you need to pay your expenses.
Basically, if you have a salary of $3000/month and your expense is only $1500/month, you can save $200 in the bank as a savings and the rest you can spend with whatever you want.
The $200 savings he said can be used for emergency situations. It's always good to have some extra money for unpredictable things that happen in our life.
I agree with the post above about the management of money and I would say, we need to search for prosperity in our life, always. So, it's a good option to try to save most money as possible every month to make an investment and increase our income on the next months. It can be a virtual investment or a real one. A good manager increase the earnings each new month.