We use 'most' to talk about the biggest part or amount of something. It means more than half or nearly all.
Most people like music.
Most days are sunny here.
'Most' can stand alone to mean almost everything or everybody in a group. It shows nearly all but not 100%.
Most of them are my friends.
I ate most of the cake.
As an adverb, 'most' means 'very' or 'extremely'. It shows a high level of something.
It is most important to study hard.
She is most happy today.
As a noun, 'most' can mean the largest amount or number of people or things in a group. It often refers to the superlative degree.
The most of the work was done today.
He has the most in the race.
'Most' is used before adjectives or adverbs to show the superlative form, meaning the highest or greatest in quality or degree.
She is the most talented student.
This is the most interesting book.
'Most' means the larger part of something, especially after dividing or sharing it. It shows the biggest part left or received.
Most of the cake was eaten.
She received most of the money.
In some informal or polite expressions, 'most' is used to show strong feeling or appreciation, meaning 'very' or 'extremely'.
That was most kind of you.
She was most helpful today.