The best way to track spending is what works for you.
For some, a big green paper spreadsheet works well. But you have to do the math. For others, technology eliminates the tedious stuff.
The key is to keep at it consistently, tracking your spending, and becoming more aware of how you use your money.
Try some free tools. Among others: Mint, EveryDollar (a Dave Ramsey product), Clarity Money, Fudget, DollarBird, and mvelopes.
Paid apps include upgraded versions of mvelopes and Fudget, You Need A Budget (YNAB; $84 billed annually), and Digit ($2.99 monthly subscription).