Shortcut key

You can customize the shortcut keys in Configuration.

And you can change it directly in the mouseright-click menu on the command buttons or menus.

    With Ctrl key With Ctrl and Shift key
A [View] command - Rotate Select all  
B [Magnet] command Select the current object  
C [Rotate] command Copy  
D [Delete face] command Unselect all  
E [Extrude selected faces] command Extrude faces  
F [Create Face] command Fit the selected part to the viewpoint  
G [Select with rope] command Show hidden face  
H [Pull] command Hide the face temporally  
I [Invert face] command Insert objects  
J   Join selected vertices  
K [Knife] command    
L [Local] command    
M [Material] command Material Panel  
N   New Hide the unselected face temporally
O   Open  
P [Primitive] command Paint Panel  
Q [Scale] command Object Panel  
R [Select with rectangle] command Make 2 vertices symmetry Rendering
S [Select] command Save  
T      
U      
V [Move] command Paste  
W [Edge] command Set center of rotation  
X [View] command-Move Cut  
Y   Redo  
Z [View] command-Zoom Undo  
Del Delete vertices, lines, and faces    
Space Fix    

In some command, [Select] or [Edge], etc., you can switch sub tool option each time pressing the specified shortcut key.

    With Shift key
F1 Show Top faces Show Bottom faces
F2 Show Front faces Show Back faces
F3 Show Left faces Show Right faces
F4 Switch single / 4 views  
F5-8 Restoration of camera information Record of camera information