"You can't manage what you can't measure" - Peter Drucker.
In the case of expenses, we can measure it, but most people choose not to. Today's tip is as simple as that, measure your expenses, so that you can actively manage it. More details here.
I have done this twice in about 10 years, first when I started working and another time a few years back. It had the effect of making me much more aware of my spend for a few years after that, so I can say the reward is certainly worth the effort. If you are having trouble keeping track of where your money is going each month, give this a try, it might be your first step towards a better financial future.