Editing video can be a long process and I find it much easier to use keyboard short cuts for the things I do most often, such as rendering, the razor tool and importing files.
Here are a few of my favourite and most used short cuts:
Space Bar Play / Stop
L play forward, press again for fast forward
J play backwards, press again for rewind
Left and Right Step back / forward one frame
I Mark in point
O Mark out point
V Selection Tool
C Razor Tool
Ctrl + N New Sequence
Ctrl + I Import
Ctrl + M Export
For more shortcuts have a look at Adobe’s website.