The word actually has several different uses in English and is very common in spoken language. 
As we will see, it is an important word to learn how to use because it allows you to change your mind about something that you say.

Actually meaning Thinking again

This is the most important meaning of actually to learn how to use properly. If you say something that you dont mean and want to take it back, or if you say something incorrectly and want to correct yourself, you can use actually at the beginning of your sentence to signify that you changed your mind.  

For example:
Do you have a pen I could borrow?
No I dont. Wait! Actually I have one right here.
Alberto Santos-Dumont was the American inventor who first invented the airplane. Actually, no, he was Brazilian.

Actually meaning In Fact

This use of the word actually means in fact and is used to point out something that was unexpected. This usage is similar to how na verdade is used in Portuguese. For example:

Are you American?
Actually, Im Australian.

Rio de Janeiro is the capital of Brazil, right?
No, actually its Brasilia.

Actually meaning Really

The word actually can be used interchangeable with the word really in some cases, similar to how realmente is used in Portuguese. It is used to emphasize that something someone has said or done is surprising.  

For example:
Did you hear that Isaac is in Saudi Arabia?
I heard, but I cant believe he was actually able to get a visa to go there.

Did you hear what Mary said to Joe at the party last weekend?
I cant believe she actually said that, that was really mean.

Actually as a softener
If you are giving someone unpleasant or unwanted information, actually can be used to soften the blow of what you tell them. 

For example:
Are you coming to the party next week?
No, I have to work actually.

Dad can we go to Disneyland?
No we cant. We ran out of money paying for your college actually.

Youre still coming tomorrow, right?
I wont be able to make it, actually.

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