For Most and Mostly?

most is an adjective meaning almost all e.g. most people have three meals a day. mostly is an adverb meaning almost all, almost completely, mainly e.g. the weather has been mostly sunny this week.

How do you use mostly?

You use mostly to indicate that a statement is generally true, for example true about the majority of a group of things or people, true most of the time, or true in most respects. I am working with mostly highly motivated people. Cars are mostly metal.

Is it correct to say mostly?

Mostly is an adverb that means 'mainly': I am mostly interested in the history of the house.