Windows Short Cut Keys
Find these keys
if you observe the when you press "ALT + SpaceBar " keys in Keyboard you will find above options for faster works you can use above short cuts to close or minimize windows also you can move the window.
"ALT + TAB" Key
for you will find what are the programs opened in windows.
Windows Key + R
For Run a program Command
to shutdown windows without mouse use
ALT+F4 (Function Key)
Its also close already opened programs & windows. These Windows Short Cut Keys are help full you in work
If you want capture or screen shot entire screen use "Print Screen" in Keyboard
you can paste it in paint or Photoshop
If you have any doubts please "Comment" Below