I am a newbie on the mac world and i'd like to know if it's possible to cut a file using a shortcut (like Ctrl + X on Windows).
This is unfortunately not built-in to OS X. However, there's a utility called FileCutter (shareware, 5USD) that will add this functionality to the Finder. Here's a description from the developer's site:
Note that you'll have to access this functionality via the context menu -- Ctrl-X won't work. Even so, still a pretty handy tool.
It is possible to cut-paste files/folders in OSX 10.7 Lion's Finder (so, since 2011), but the OSX way is slightly different from the Windows way.
So, the steps are very similar to copy-paste, but holding ⌥ (option key) moves the file/folder instead of copies it.
You can also have a look in the edit menu after copying a file - press ⌥ while looking to see the difference: "paste" changes to "move item here".