Standard Copy Paste Keys
First, turn on the CUA mode, under the menu 〖Options ▸ C-x/C-c/C-v Cut and Paste (CUA)〗. The CUA mode will activate the following shortcuts:
【Ctrl+x】 for cut
【Ctrl+c】 for copy
【Ctrl+v】 for paste
【Ctrl+z】 for undo (emacs 23 (2009-07) or later)
Also, it will highlight when a region of a text is selected. And, when a text is selected, typing any text will automatically replace the current selection. Pressing the ⌫ Backspace key will also delete the selection.