Direct answers to the money questions people actually ask — how much rent, how much car, how big an emergency fund — each one answered with real numbers and a rule of thumb you can apply to your own situation.
Each answer here gives a number and the rule of thumb behind it, so you can apply it to your own situation rather than copying a figure that assumed a different income. Read the reasoning, not just the answer.
Where an answer depends on where you live or what you earn, the guide says so and points at the calculator that takes your figures. Rules of thumb are a starting position, not a verdict.
If two answers here seem to conflict, check the assumption each one states about income and city. Most money questions have no single right figure — they have a range, and the useful skill is knowing which end of it your own situation sits at.
Where an answer caps something as a share of income, read the percentage as a ceiling and not a target. A rule that says no more than 30% on rent is not an instruction to spend 30%; it is the line past which the rest of the budget stops working.