How do you record your finances/budget?

Do you use a spreadsheet?
Do you keep record by hand or on your computer (I’m assuming most people especially on here use Excel or some sort of computer program like Quickbooks)?
What are the categories you break down your expenses into?
How frequently do you update it?
What’s your best advice for someone who is just starting to keep track of their expenses?

Please specify if you are talking about personal/family or business.