Fine can be synonymous with good. this words mean "bien" or "bueno"
estoy bien. I am good
Estoy bien y haciendo el bien.
"Fine" translates differently depending on which meaning you wish to convey. There are a wide variety of meanings that use different Spanish words Fine as in "a monetary penalty; a speeding fine": Multa Fine as in "of good quality": magnífico, hermoso. Fine as in "sharp" or "thin": fino Fine as in "okay, all right" : bien
Estoy bien = I'm OK/doing fine etc.
so I'm fine
Estoy bien means I'm fine in Spanish.
i am fine = estoy bien
Bien.
I am fine Yo estoy bien
Estoy bien = I'm fine
They are fine = Ellos son buenos
I am sure you will do fine in Spanish is Estoy seguro de que lo hará bien