Blender 3D Keyboard Shortcuts
When using Blender, I recommend that you use the Maya Keymap presets, since it is better to learn shortcuts that are more similar to others application like Maya or Unity3D.
If this is your first time using Blender, you can also take a look at my page that explain the most common settings you might want to change in the User Preferences Blender3D User Preferences Options.
Q = Selection
W = Translation
E = Rotation
R = Scale
F = Make Face
K Left Mouse = Knife Topology Tool
Ctrl+R = “Ring” Loop Cut and Slide
GREASE PENCIL HOTKEYS
Hold D + Left Mouse = Draw
Hold D + Right Mouse = Erase
Hold Ctrl+D + Left Mouse = Draw a line
Hold Ctrl+D + Right Mouse = Draw a poly line
D+Tab = Enable Editing (Edit Strokes)