Essential Hotkeys

G - HIDES GRID
Z - ZOOM EXTENTS (fit objects to view)
(THIS ONLY WORKS IN PERSPECTIVE; YOU MUST CHANGE PHYSICAL CAMERA OR MAKE SURE PHYSICAL CAMERA IS NOT ON.)
T - Top
B - Bottom View
R - front view
L - left view 

D - Pivot Mode

spacebar (tap) - see all viewports

CTRL+H - See lighting

right-click - polygon editing modes (face, vertex, edge, etc.)

spacebar (hold down) - see menu
Alt+W+cursor - enter viewport
Middle Mouse panning

Soft Selection Mode

Soft Selection (B+click+hold+left click)
Scroll - Zoom
alt-middle click - orbit

alt+rick-click - zoom

f8 - component mode

J+left-click-drag - moving shape to snap on grid points
alt-q - isolation mode
s -p exit out of snaps
CTRL+V - CLONE
Ctrl+Shift+Click - Quick Select (while in polys mode)
Alt+X - Make visible/invisible
4 - Wireframe
5 - return back to default shading (after in wireframe)


Altered UI Hotkey(s):
Shift+T - Transform Toolbox