Clear your doubt - Most vs Mostly
Most without an article is usually used as an adjective, which means almost all or the largest part.
For example:-
- Most days I go for a jog.
- They ate most of the cake.
It's also used to form the superlative where it goes in front of most adverbs.
For example:-
- He objected to the results of the election most strongly.
Mostly is an adverb. It's not used very often. It means generally, mainly, chiefly, usually etc.
For example:-
- They're mostly good people, although they have made a few mistakes.