As of today,Windows 10 is available as a free upgrade for Windows 7 and Windows 8.1 users.
All the new important features added have been made easier to use with the Windows key shortcuts.
Ctrl + X Cut the selected item.

Ctrl + V (or Shift + Insert) Paste the selected item.
Ctrl + Z Undo an action.
Alt + Tab Switch between open apps.

Alt + F4 end the active item, or exit the active app.
Windows key + L Lock your PC or switch accounts.
Windows key + D Display and hide the desktop.
New keyboard shortcuts
Windows key + A Open Action Center.
Windows key + G fire up the new Game DVR recorder when a game is running.
Windows key + H Open Share Charm.
Windows key + I Open Windows 10s controls.
Windows key + Q Open Cortana in listening mode.
Windows key + S Open Cortana ready for typed input.
Windows key + Tab Open Task view.
Windows key + Ctrl + D Add a virtual desktop.
Windows key + Ctrl + Right arrow Switch between virtual desktops youve created on the right.
Windows key + Ctrl + Left arrow Switch between virtual desktops youve created on the left.
Windows key + Ctrl + F4 end the virtual desktop youre using.
Windows key + Left Snaps active window to the left.
Windows key + Right Snaps active window to the right.
Windows key + Up Snaps the active window to the top.
Windows key + Down Snaps the active window to the bottom.
you’re free to also refer to the mini manual about Windows 10 features given in thisarticle.
Also read:How To Find Windows 10 Product Key And How To Activate It
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source: www.techworm.net