A piece of advice that I have learned the hard way is to always keep up with bank statements. It's great because it's already organized, you just have to ensure everything is correct. There has been various times where I have checked my balance and it didn't seem correct and it was due to being accidently charged twice. If you don't own a credit or debit card I would strongly recommend having a small notepad to write what you spend on. This can not only help you organize your spending, but overall help you visually see if what you spend the most on is of priority.