Both of these words say the same thing and mean the same thing. Yet, they are the most important part of your book. Fiction or non-fiction, the beginning/opening needs to grab the reader’s attention. You can start your story in the middle where the action or excitement begins. This is where you can grab the reader and their interest. When you go back for more details, your readers will follow.
If there are other action filled events, do not start with the BIG ONE. Keep the readers with you. Give them a reason for reading your work. Let them get acquainted with the protagonist’s beliefs, lifestyle, family, and friends.
What about the antagonist? He or she might be a friend, a family member or a stranger, who makes it into the close circle of the protagonist. Now, you can make the story run fast forward, slow, even in reverse. You can go steady and include slight bumps. This is what you give your reader knowing their attention is right there with you.
The ending must give the reader knowledge of the character, protagonist, showing a triumph, coming up with something different, or maybe disappointed with the final results. Be certain to tie the ending back to the beginning. Does the story come to a full circle? Do not make the reader shake their heads. Leave the ending to linger in the mind of your readers. You’ll hear, “I never thought the end would come so soon.” When you hear, “I wonder if there will be a sequel?”
Then you will know your beginnings/endings or openings/closings satisfied the reader.
Great writing. Happy writing.