The perfect tenses in spanish are when you want to express something like "I have already done that."
There are two ways to do this in spanish: the presente perfecto, and the pluscuamperfecto!
if there's a double vowel, put an accent over the i:
This is very similar to the Present perfect, except think of it like "had ______ed".
Think of it as slightly more past tense than the present perfect.
To conjugate haber in the past tense:
Then the same past participle of the present perfect.