Formal:
* Obrigado(a): This is the most common and general way to say thank you. It is used for both men and women.
* Muito obrigado(a): This means "thank you very much" and is a more polite and emphatic way to express gratitude.
Informal:
* Obrigado(a): This is also used informally.
* Valeu: This is a more casual way to say "thank you" and is typically used among friends.
* Obrigado(a) pela ajuda: This translates to "thank you for the help" and is a more specific way to express gratitude.
Other options:
* Agradeço: This is a more formal way to say "thank you" and is often used in written communication.
* Agradeço imenso: This means "thank you very much" and is a more formal and emphatic way to express gratitude.
The choice of which phrase to use depends on the context and your relationship with the person you are speaking to.