what is the exposition of ch 1-5

Exposition means the "background" information. Getting to know the characters (Huck, Mrs. Watson), finding out the setting, seeing the way Huck lives (his father) gives you background information. You need to find the information that your teacher wants you to focus on, but usually it means specific characters and setting.

Background information helps find what information you're looking for. Sort of like a clue hunt.

Exposition means the "background" information. Getting to know the characters (Huck, Mrs. Watson), finding out the setting, seeing the way Huck lives (his father) gives you background information. You need to find the information that your teacher wants you to focus on, but usually it means specific characters and setting.