Every object in a scene has a Transform. It's used to store and manipulate the position, rotation and scale of the object and store more information like mesh, materials, collider, light or camera. It also has a parent and children, which construct object hierarchy in the scene.
Full list of properties of a transform
Name : Name of the transform. To change name, edit the value in Properties Tab
Position : Position of the transform relative to the parent transform in X, Y, and Z coordinates.
To change position: Edit the value in Property Tab or the use Position Gizmo.
Rotation : Rotation of the transform relative to the parent transform's rotation around the X, Y, and Z axes, measured in degrees.
To change rotation: Edit the value in Property Tab or use the Rotation Gizmo.
Scale : Scale of the transform relative to the parent along X, Y, and Z axes. Value 1 is the original size.
To change scale: Edit the value in Property Tab or use the Scale Gizmo.
Hierarchy : Hierarchy of the current transform. (Hierarchy displays in Scene Hierarchy Tab)
To change hierarchy: