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The grid visible in the 2D and 3D viewports gives you an indication of how big your objects are. It is recommended to use the grid to check if your objects are the size you intended.
The 3D viewport has a grid size indicator at the bottom right of the viewport showing the current grid size. There are two ways to display the grid: adaptive and absolute. These options are available in the Preferences> Viewport section.
Adaptive grid will automatically re-size the grid as you zoom in and out of the scene. The grid size indicator will change, providing information about the current grid size. The number shown is the distance between two bright lines in the grid.
Absolute grid allows you to set a fixed size for each grid square and will not change when you zoom in and out.

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Instead, 2D

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viewports will always show an adaptive grid.

Navigation

These are the basic functions to navigate in the graphical viewports:

• ALT + LMB = Rotate camera around the target origin
• ALT + MMB = Pan camera
• ALT + RMB = Zoom camera in/ out
• ALT + CTRL + LMB = "Slow-mode" – slowly rotate camera around the target origin.The up/ down arrows on keyboard can be used to change how slowly the camera should move in this mode. You can repeatedly press the up/ down arrows to adjust, then use ALT + CTRL + LMB.
• ALT + CTRL + MMB = "Slow-mode" – slowly pan camera.
• ALT + CTRL + RMB = "Slow-mode" – slowly zoom camera in/ out.
• ALT + SHIFT + LMB = Rotate camera target around the camera origin.
• ALT + SHIFT + RMB = Displace camera origin along the look-at direction. This also moves the camera's focal point (camera target), along with the camera.
• ALT + SHIFT + MMB = Roll camera.

Keep in mind that the Ctrl key in Windows corresponds to the Cmd key in Mac OSX, so wherever the Ctrl key is used on a shortcut, Mac users should use the Command key.

Additionally, there are quick navigation options when right-clicking on a viewport:

• Reset Viewport will reset the viewport to a default perspective view.
• Look at Selection applies to both camera and perspective view and it centers the selection in the viewport without changing the position of the viewer or the camera zoom.
• Center Selection centers the current selection (objects and/ or groups) in the viewport.
• Center Scene centers the entire scene in the viewport.

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