Let's say that your classmate wants to come over to your house in the weekend. He then asks you for directions going to your house.
How will you give him these directions?
When giving someone directions, you must describe what you want someone to do in a clear and orderly manner. In this case, you must describe what you want your friend to do so he could get from his house to yours.
When you write down the directions, you will be using sentences like the following:
Notice how the words first, then, and after that give order to your directions, so your friend would know what to do before and after each command.
Giving directions does not only apply to telling people where to go. When you ask someone how to cook a certain kind of food or how to build a certain kind of toy, you will be following directions that someone will give you.