Narration is telling the story thought the eyes of the Narrator. But I want to share ideas but this topic. Even this is a short chapter, I want to inform you:

1. Please do not reveal too much. As a Narrator, the purpose is to lead the readers into a conclusion. Giving the plot away ruins it. So do not give away the ending. 

2. Understand that as the Narrator, the characters don't know what you know. So proofread you work before you publish. If the characters do know, please do it under the fourth wall break story.

3. If a character is a narrator, 1 still applies. Do not spoil the ending. Foreshadowing with care because the narrator is a character in this case. If the character knows the ending, it is best for the character to hush about it.

Anyways these are my short list of tips. Remember to research  if you need to know more.