"The woman speaks English."
Translation:Η γυναίκα μιλάει αγγλικά.
Both are 100% correct. They are different forms of the same verb. The verb is μιλάω-μιλώ and is conjugated like this:
μιλάω / μιλώ
μιλά / μιλάει
μιλούμε / μιλάμε
μιλούν/ μιλούνε / μιλάν / μιλάνε
These verbs are called συνηρημένα ρήματα and they are explained in tips of the present 1 lesson.
Are you using the website or a mobile app? As far as I know, the tips and notes are only available on the duolingo.com website.
So if you're using a mobile app, consider using your device's browser to visit the website at least when you start a new skill to have a look whether that skill has tips and notes. You may need to set your mobile browser to pretend it's a desktop in order to see them.