Widgets fall in different categories for different uses on pages.

• Widgets in the "Organic Groups" category would be used in creating your home or about page.
• Widgets in the "View Panes" category would be used on pages where you want to display recent comments.
• Widgets in the "Group Dashboard" category are typically embedded into one of the regions of a panel page.
• Widgets in the "Group Menu Items" category typically populate an entire page.

Click on links in the left column of the table below to see an example of the widget dashboard. 
Click on links in the right column of the table below to see examples of those widgets being used on pages.