General "here":
* Aqui (pronounced ah-kee) - This is the most common and versatile translation.
* Neste lugar (pronounced neh-shte loo-gahr) - This means "in this place".
* Nesse lugar (pronounced neh-se loo-gahr) - This means "in that place".
* Aqui mesmo (pronounced ah-kee mehz-moh) - This means "right here".
Specific contexts:
* Here, take this: Aqui, tome isto.
* Here you go: Aqui está.
* Here is the book: Aqui está o livro.
* I live here: Eu moro aqui.
The best translation for "here" will depend on the specific situation and the nuance you want to convey.