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Frequently used hot keys:

 

Navigation
Zoom Z + Drag
Pan X + Drag
Camera Orbit C + Drag
Reset Viewpoint Shift + Q

 

Viewports
Toggle 1 / 4 Viewports Alt + 1
Frame All in current viewport A
Frame All in all viewports Shift + A
Frame Selection in current viewport F
Frame Selection in all viewports Shift + F

 

Transforms
Scale E + Drag
Rotate R + Drag
Translate T + Drag