Prepositions are an important part of any language. They can show how things relate in time and in place or position.
Let’s meet AT 7:30.
Let’s meet at the park BY the green bench.
Prepositions can also indicate a method, or how something is done.
Can I pay BY credit card?
Prepositions can be difficult to learn, but I have found using them in natural sentences is the best way to help you understand and remember these important words.