1) Open a saving account which your money only goes in and not goes out.
2) If you earn extra money such as tax return or gift money, deposit it into your special account.
3) When you go shopping, write a list and stick to it. Unless there is something necessary to buy, do not spend your money on other things.
4) If possible, reduce your outside expenses such as entertainment and meals. Try to cook and spend more time with your family at home.
5) Sell your unused stuff to second hand shops.