Invoice date, posting date, document date field meanning in SAP

Hello Everyone, It is my first time join community.

My question is in SAP FI view t-code FB60, what's date should I enter in each field as invoice date and posting date? When I entry invoice date then posting date seems greet out, which date determines due date(based on payment term)? how to change posting date? if there are document date too, what's the different definition? it seems one is invoice issued date, one is accounting posted date, one is invoice receipt date?

Thanks in advance for whom answer my question. Good day!