A memoir is more than an autobiography or record of what you did or what happened to you over the course of your life. An autobiography is a broad look at your life. Think of a theme as “What this book is about,” or “What holds these stories together.
If you take note of when and how these different techniques are used, you can apply them to your writing.
A great ending is all in the build-up.
The arc is the emotional or psychological growth, transformation and development of your character
What should a third chapter do?