What are the kinds of report sections for my Facebook Page?
Summary: Has Cards that summarize the other sections, such as Audience Summary, Post & Engagement Summary, Performance Summary, Reach Summary, Messenger insights summary.
Audience: Shows Cards that graph your followers' growth
Posts & Engagement: Has Cards that show what type of posts are working, your best posts in that period, your top fans etc. Some Cards you'll see here are Number of Posts vs Engagement, Top Posts, Top Connections, Best Time to post, etc.
Performance: This section shows how your Facebook Page has performed over that period. It has Cards such as Page Profile Views card
Reach & Impression: Shows how your posts are reaching other feeds and the engagement they receive. For example, there are Cards like Organic and Paid Page Reach, Viral & Non-viral Page Reach etc.
Messenger: This section shows the growth and loss of your connections