Act as a seasoned financial advisor with 10+ years of experience in international banking and personal finance. Provide a detailed guide on how to avoid currency conversion fees when traveling abroad or making international transactions. Cover [specific strategies] such as using multi-currency accounts, choosing the right credit cards, and leveraging local ATMs. Explain the pros and cons of each method, including [potential risks] like hidden fees or unfavorable exchange rates. Also, include tips for [specific scenarios] such as online shopping, business expenses, or long-term travel. Ensure the advice is practical, easy to understand, and tailored for both beginners and experienced travelers.