Widgets (sometimes called tools) provide additional functionality beyond simple viewing. Widgets can “live” (show up) on the interface in the widget boxes (spaces). These may show up in different locations and with different “space limits,” depending on the type of Theme chosen. If additional widgets are needed, they can be added in the header section (upper right). Three to four tend to show up, then a small “triangle” appears that indicate more widgets can be found in a drop down list.
This video shows a brief overview to start working with widgets. This video shows the different places where widgets appear and how to make some very basic changes.