This is the 5174th most frequent Spanish word.
hecha
"Made" or "done" (feminine form).
Here, 'hecha' is used as a past participle acting as an adjective to indicate the state of the noun 'tarea'.
La tarea está hecha.
The homework is done.
In this case, 'hecha' is part of an idiomatic expression, meaning mature or complete, metaphorically describing a person.
Ella es una persona hecha y derecha.
She is a self-sufficient and straightforward person.
Finally, 'hecha' serves as the feminine form of the past participle in a passive construction to indicate that the subject was created or manufactured.