In the advent of smartphones, I would suggest installing some budget apps where we can track our spending and record our budget for a certain month or year. I have one mine for years now. What I usually do is challenge myself to save more every single month and what I do is adjust some expenses on certain stuff that I have budgeted last month and when you do that, it will become a habit - a good and productive habit.
That is an additional option but others can start even for a small notebooks. Yes a classic old style one but rocking thru centuries. But in my own preferences, Im using excel sheets to track all my spendings and earnings.
Overall, we have different style to track on how we will managed our money. At the end of the day, no matter style we used to track our spendings, it's still up to us if how we will handle our financial strategy.