The Difference Between Active and Passive in Spanish

In Spanish, when you change the state of something, you can use estar to mean that but a passive is formed using said. If I'm using sort of the change of state, the example that they gave me was the door was closed. La parta esta bacerada because it's a change of state. But in other cases, you'd use ser. So la parta fue serada or you see a lot. It's also used if you have an indefinite subject. That's like some some indefinite person associated with this place speaks Spanish. And so that's less considered a change ofstate as more just straight up passive or so.