0 Spend

Okay I know I’m only 17 but I want to start early as possible learning how to manage my finance and just have it to were I can go back and analyze my expenses to make sure I’m not spending carelessly. Oh and if there is and online website for managing personal finance would you use it? Or would it probably be best not to because ppl or the gov can easily see what you’ve been doing or something?
Any suggestions?

http://www.youngmoney.com/calculators/personal_finance_calculators/home_budget