Credit card rewards are the most polarizing frugality topic. Evangelists claim they fund free travel indefinitely. Critics point to the debt that cancels every benefit. Both are correct about different populations.

The only rule that matters: Pay the balance in full, every month, without exception. Credit card interest rates are 20–30% APR. No rewards program generates returns that survive carrying a balance. If you cannot commit to this rule, do not pursue rewards cards.

Food is where travel budgets collapse fastest. A week of restaurant meals in a major European or US city can run $500–$800 per person without extravagance. The alternative is not eating badly — it is eating differently.

Eat where locals eat lunch. In most countries, the midday meal is the main meal, eaten at places catering to workers on a time and budget constraint. These restaurants serve better food than tourist-oriented dinner establishments at one-third to one-half the price. A restaurant with a handwritten specials board and no menu in multiple languages is almost always cheaper and better.

Budget travel has a reputation problem. It conjures 14-hour bus rides, hostile dorms, and meals that should not be eaten. That reputation is mostly wrong. The cost of travel and the quality of travel are far less correlated than the travel industry wants you to believe.

Dates move prices more than destinations. A flight on Tuesday or Wednesday is consistently cheaper than the same route on Friday or Sunday. Shifting travel by 48 hours can save $100–$300 on a domestic round trip. This is the single highest-return flexibility you can offer when booking.