Post Reach, Post Engagement, and Insights
Post reach refers to the number of unique individuals who visited your web page, or saw one of your posts online.
Post engagement is where someone performs an action on your webpage, by either 'liking' your page or commenting on one of your posts.
Insights gives you an overview to the posts left on your site. this would come in handy in evaluating what's working and more improtantly, when it's working.
My website is currently up, but had very little in the way of views. I am working to get my views up. I did not try to add any apps to my page, as it's a fictitious business.