When selecting a transform, the gizmo panel will show.
Clicking the different buttons on the gizmo panel, will display different gizmos.
See Gizmos for more details
When selecting a clip in the Animation Tab, the animation panel will show.
Click play button to play selected clip. See Animation Tab for more details.
Right-click in empty area will bring right-click menu.
Create Transform: Create an empty transform in the current scene. See Create Transform
Create Light: Create a light in the current scene. See Create Transform
Create Camera: Create a camera in the current scene. See Create Transform
Right-click on a transform will bring another right-click menu.
Focus: Focus on current transform.
Delete Transform: Delete selected transform in the current scene. See Delete Transform