Is there a way to switch the control and cmd keys while working with blender? The short-cuts bacome kind of inconvenient, because I am used to work on windows
You can change it in the user preferences in the left corner by clicking on File then User Preferences. From the window that opens choose the Input tab and then change the keyboard shortcut for the desired key. Then you are done.
You can get the pdf for keyboard shortcuts. It's a simple keyboard shortcut PDF and may help you in future.