Different operating systems and different applications have different interpretations of keys and key combinations, but a common interpretation for the CTRL-END key combination is "move to the bottom end of the page."
It saves the file.
That's the shortcut for copy. The shortcut for paste is Ctrl V.
Ctrl+End is a typical shortcut to the end of a document
The action assigned to shortcut keys can be different in different applications. In the case of Microsoft Excel, Ctrl+1 is a useful shortcut to the format dialog, where you can assign cell formats, borders, etc.
ctrl+k
The keyboard shortcut notation ctrl plus esc means you press the Control key concurrently with the Escape key. On a Windows PC, the Ctrl + Esc shortcut produces the Start Menu.
That depends on the application. Commonly it is the F5 key, like in Word and Excel. Ctrl-G can be used as the shortcut.
ctrl+B
There are many keyboard shortcuts, some of them are ctrl + c, alt + f, alt + e, f1, ctrl + a, ctrl + x, shift + del, Ctrl + Ins, Ctrl + V, Shift + Ins, Home, Ctrl + Home, End, Ctrl + End. There are also Shift + Home, Shift + End, Ctrl + Left arrow, Ctrl + Right arrow, Ctrl + A, Ctrl + B, Ctrl + C, Ctrl + F, Ctrl + Z, Ctrl + U, Ctrl + R, Ctrl + E, Ctrl + L, Ctrl + Y, Ctrl + X and Ctrl + R.
The keyboard shortcut function control-w or ctrl-w closes the window of the program you're in. It's the opposite of ctrl-n, which opens a new window.
Ctrl+C is a keyboard shortcut for 'Copy'. Ctrl+V is the shortcut for 'Paste'. Ctrl+X does 'Cut', and Ctrl+Z does 'Undo'. Alt+Tab switches between windows.
Ctrl-xCtrl+X