In a single word we can say that behavior is what user do on your website like what page they visit. They fill any form of they do anythings on our websites.
Pageviews: How many pages views by users
Unique Pageviews: Only one time page view count
Avg. Time on Page: How much average time user stay on page.
Bounce Rate: The number of visitor who come to your page of leave very quickly or leave without visiting any other blog.
Exit Rate: we define exit rate as % of user who exit a page of a website.