Usage patterns
〈事〉の要旨をまとめるto summarize the main points of something
I concisely summarized the main points of the meeting.
要旨を述べるto state the gist (of an argument, speech, etc.)
He stated the gist of his paper.
要旨を提出するto submit an abstract (of a paper, presentation, etc.)
I submitted the abstract for the conference presentation.
要旨に基づいて〈動詞〉to do something based on the summarized main points
I thought up questions based on the summary.