Use of preposition "Of and " 's "

Possession:

Of : Used for non alive things such as Chair, Table, Wall etc.

‘s : used for person, group of people, animals, organization, country .

Examples:

The leg of chair is broken.

My father’s house is very nice.

Expression of quantity:

A lot of students watch vedio lectures.

A number of people study English.

Lots of animals live in zoo.

A great ful deal of students hates exams.

Majority / Minority of cats eat mice.

A couple of super horses were seen at the mall.

All of students hate exams.