→ Ctrl + Shift + V = Add Vector Layer
→ Ctrl + Shift + R = Add Raster Layer
→ Ctrl + Shift + D = Add PostGIS Table(s)
→ Ctrl + Shift + L = Add SpatiaLite Layer(s)
→ Ctrl + Shift + W = Add Layer(s) from WM(T)S Server
→ Ctrl + Alt + M = Processing Modeler
→ Ctrl + Alt + P = Python Console
→ Ctrl + P = New Print Composer
→ Ctrl + Shift + P = Project Properties
→ Ctrl+ Alt + C = Processing Options
→ Ctrl + Spacebar + O = Open another *.qgs project
→ Ctrl + Shift + J = Measure tool
→ Ctrl + Shift + H = Uncheck all layers in dock
→ Ctrl + Spacebar = Check/Uncheck highlighted layer