Learn Dutch: Jij bent een vrouw.

Both mean "you" (singular and informal). Jij is the stressed form, used when you want to put emphasis on the person (like saying "You are a woman"). Je is the unstressed form that you will use and hear most of the time in everyday conversation.

Why does the verb change to bent here?

Bent is the form of the verb zijn (to be) that matches with jij (you). Just like in English, this verb is irregular. For "I", you use ik ben (I am), but for "you", you add a 't' to make it jij bent (you are).

How do you pronounce een?

Even though it has a double 'e', een (meaning "a" or "an") is pronounced with a short, relaxed "uh" sound, similar to the "a" in the English word "about". If you want to say the number "one", it is written as één and pronounced with a long "ay" sound.

Would I use jij bent when speaking to anyone?

No, jij is the informal word for "you". You use it with friends, family, children, and peers. If you are speaking to someone in a formal setting, you would use the formal pronoun u, which also pairs with the verb bent: u bent.