hearing something grinding from the engine?

So I drive a 2006 Nissan Ultima I was driving it and then all of a sudden I start hearing like the rotor or something grinding something. The caliper broke I think or it just fell apart so I put it back together well my son came and helped me thank God nothing else happened but now it’s making a weird sound and the belt is making a sound we change the belt if not like we put it on right but it’s not even or something And every time I break it feels like it’s going to break like if the two front is going to break it sounds like a knocking on the tires. I’m going to load some videos so you guys could kind of see I need help with what I think it is.