More is the comparative form of much and many. It indicates a greater amount or number than that is indicated by much or many.
- You should sleep more than you do at the moment.
- I need more time to finish the work.
Before a noun with a determiner we use more of.
- He is more of a fool than I thought. (NOT He is more a fool than I thought.)
- Three more of the missing miners have been found. (NOT Three more the missing miners …)
More can mean ‘again’.
- Do it once more.
- Do you want to go there any more.
More or less means about.
- It is an hour’s journey, more or less.
Be no more means be dead.
- She is no more. (= She is dead.)
Most is the superlative form of many and much. It indicates the greatest in number, quantity etc. In comparisons most is normally used with the.
- Those who have the most money are not always the happiest.
- Susie found the most strawberries.
When no comparison is implied the is not used. In such cases most simply means ‘the majority of’.
- Most Indians understand Hindi.
- Most people like babies.
Before a noun with a determiner (articles, possessives, demonstratives) we use most of.
- Most of the people here are farmers. (NOT Most the people here are farmers.)
- Most of us like to watch a good movie. (NOT Most us like to watch a good movie.)
Most can mean very.
- This is a most interesting book. (= This is a very interesting book.)