How can I reduce expenses on currency conversions? [duplicate]

I would like to know the best way to reduce expenses on currency conversions. I think I have 4 options:

Buy money in an exchange money house in my home town.
Use my debit/credit cart to pay bills.
Get money from an ATM.
Buy money in an exchange money house in the country where I'm visiting.

What is the less expensive?

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How can conversion costs be avoided?

How to avoid foreign transaction fees

Get a fee-free credit card. ...

Open a bank account with a foreign transaction fee-free institution. ...

Exchange currency before traveling. ...

Avoid using foreign ATMs. ...

Avoid the Dynamic Currency Conversion.

How can exchange losses be reduced?

How to minimize currency conversion loss

Register your business in multiple jurisdictions. Register your company as a local entity in the markets where you are doing business. ...

Localize price points. ...

Integrate local payment methods. ...

Monitor market trends in currency conversion.

How can you avoid DCC charges?

DCC charge is applicable when you opt for Home Currency (i.e. USD) instead of Local Currency for an international transaction. Avoid DCC charge by selecting local currency/without currency conversion.

What is the cheapest way to convert currency?

5 Cheap Ways to Exchange Currency

Stop by Your Local Bank. Many banks and credit unions offer a foreign currency exchange service for a fee. ...
Visit an ATM. ...
Consider Getting Traveler's Checks. ...
Buy Currency at Your Foreign Bank Branch. ...
Order Currency Online.

Dynamic Currency Conversion - Don't be tempted to pay in your HOME currency

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