Introduction to Scene Gizmo in Unity

Notes:

Introduction to Scene Gizmo in Unity:

Scene gizmo: Introduction
Scene gizmo is present at the top right corner of the scene view. It has a cube at the center and cube is surrounded by 6 conical shapes. In which 3 of them are labeled with X, Y and Z.
The label under the scene gizmo indicates the current view of the scene.

Use of scene gizmo:

Scene gizmo indicates the current orientation and direction of X, Y and Z axis of the world; which help us in moving and placing game objects efficiently.

Note:
Red cone indicates +ve X axis,
Green cone indicates +ve Y axis,
Blue cone indicates +ve Z axis

Scene gizmo allows us to switch between the perspective, orthographic & isometric views.

1. Orthographic view: 2D view (2D games)
-- is meant to show only one side of the object at a time

2. Perspective view: 3D view (3D games)
-- is meant to show more than one sides of the object at a time with depth

3. Isometric view: pseudo 3D view (2.5D games)
-- is meant to show more than one sides of the object at a time with no depth
-- 2D projection of 3D environment drawn at 30 degrees
Ex: Age of kings, Star craft, Sim city, Age of empires, Dota etc.