¿Cuál es la diferencia entre got it y understand it ?Puedes dar oraciones como ejemplo.

I got it is like when somebody trew a ball at and and ask did you catch it and your answer is most likely to be I got it and understand it, it is mostly used or basically only used is when someone is saying or like a teacher for example when the teacher was talking about history and you looked confused so the teacher asked you if you uderstand it or you just don't understand so you raise you hand to tell the teacher i dont uderstand it but if you mean get it and understand it well get it is a short way to say do you understand our lesson - did you get it, our lesson or you getting it but got it and get it can be used as I understand it or I don't understand it in some sentences or conversations sorry if this was cofusing