in these lessons, i knew how many prepositions and how to use preposition. before i think prepositions are all the same and there are two prepositions such as time and place but in this lesson, there are preposition of place, movement, manner etc...
i go to school.
to is preposition of place but in details to is the preposition of direction
she walked across the street.
across is preposition of movement.
i can categorize the right topic.