This is the 4850th most frequent Arabic word.
الخلاصة
Summary or conclusion.
Here, "الخلاصة" means 'the conclusion or main point' of the lesson.
الخلاصة من الدرس هي أنه علينا العمل كفريق.
The summary of the lesson is that we need to work as a team.
In this sentence, "الخلاصة" refers to a section at the end of the book summarizing the main points.
تأتي الخلاصة في نهاية الكتاب عادةً.
The summary usually comes at the end of the book.
Here, "الخلاصة" is used as 'the synopsis or brief overview' to grasp the main concepts.