Direct - Visitors who typed the URL or used a bookmark to reach your site.
Referral - Visitors referred by links that are not tagged.
Organic - Visitors referred by an unpaid search engine result.
Not Set - Referred by a campaign but that campaign name is not set.
The Bounce Rate represent single visits to a page without clicking on any additional links. This is usually indicative that the customer did not find the content that they were looking for on the page and abandoned the page. You might ask yourself what content is missing on pages with high Bounce Rates that customers are expecting but not finding. On pages with high Bounce Rates, you might try to find ways to entice visitors to click further into your site.
Time on Page is valuable for determining if customers are viewing the content on the page or immediately clicking through to other pages.