What's the use of Function Keys in keyboard (F1,F2,F3,F4....)

What's the use of Function Keys in keyboard (F1,F2,F3,F4....)
Keyboard function keys and their work

[notice:
key-what it will do-what it will do explained]
f1-help center-it will open windows help center
f2-rename folder/file-after selecting file a press  f2 key then u can rename the the file
f3-to find or search words-it will open search option in browser and also desktop when you starting ur pc pressing this key will take you  into run recovery
alt-f4-close current application desktop-shutdown/restart
f5 -refresh/reload-refresh the desktop and its reloaded in browser
f6-url jump-it will take u in the url section in your browser
f7-document spelling check-that will check spelling on any document
f8-safe mode -select all text in ms-there are some windows mode safe mode normal mode safe mode with networking this key will take you safe mode while starting and also it will select all text in a page in ms word
f9-ms word with c and a-alt and shift in use ms word don't work in windows
f10-shift  for shortcuts=it will show u shortcut menu in ms word
f11-full screen-it will open full screen mode-it also take you in boot menu in while starting your pc
f12-save as in ms-it will open save as dialogue box in ms word

editing.............
by Maruphi (admin)