A conventional budget involves writing down your expected expenses every month and tracking them every month.
If you are in a situation where you do have some disposable income to save, invest, or pay down debt, then you can simplify the way you manage your finances every month.
Having a baseline will allow you to determine the current gap between income and spending to develop a plan.
This will be the key to success if you use this approach. Of course, you won’t get this perfect at first, but getting started is the key.