The rules for ellipses in nonfiction differ slightly from those in fiction. In fiction, ellipses signal a hesitation or trailing off of speech. But in nonfiction, they indicate omissions from quoted material. If you’re writing a memoir or other narrative nonfiction, you may use ellipses the way they’re used in fiction.
When you use an ellipsis to indicate an omission, you must take care not to misrepresent the original text. Using ellipses to get around parts of a quoted work that oppose your argument while leaving the bits that support it is cheating the reader. For similar reasons, don’t use an ellipsis to join sentences from passages that are widely separated in the original.