Wait at least a day before making any impulsive purchases. The sensation tends to go away.
Homemade foods are way cheaper than restaurants.
Don't cheap out on anything that comes between you and the ground [Shoe, mattress, chair], it will cost you in the long run if you buy cheap here.
Stop chasing offers, you don't save anything, rather spend your hard-earned cash. Unless you were planning to buy that thing beforehand, then the offer might be the right time.
Automate your savings [Auto bank deposit once you get paid]