When we talk about keyboard shortcuts we need to make a distinction between system wide (or global) keys and application keys. Here you can find a nice overview of the first category as supplied by Microsoft.
I am a Dutchman living in Belgium. As an ICT professional I spend a lot of time with my pc . Even in my spare time you can find me hitting the keyboard more than I should (at least that's what my wife is saying). So I try to make this bad habit as comfortable and efficient as I can. You don't have to be a power user to take advantage of keyboard shortcuts.