Some commands for my system are different than what is shown on other websites. On my system, I press "Ctrl+g" to display the help menu and command list. ^ = the "Ctrl" key, M- = the "Esc" key
Esc+a Mark selection for cutting and pasting. Press Esc+a at the beginning of the selection and then move the cursor to the end of the selection. Now the selected text can be copied or cut to the buffer.
Alt+6 copy text to the "cut buffer"
Ctrl+u paste selection or line
Ctrl+k cuts selection or line (it is cut/sent to the "cut buffer").
If no text is marked, 'paste' and 'cut' command will copy or cut the entire line of text.