Working with XFCE on a laptop. I can select text by just selecting it with my trackpad. I can paste it everywhere with my right mouse click. That does not always starts and finishes the paste process. Most of the time XFCE (I think) pops up a confirmation dialog.
I only have a two button mouse so, your mouse/trackpad settings may have other options.
Indeed Shift+Ctrl+V insert in the console editor, or vi (in insert mode).
It depends also on the application that receives the paste: in Firefox Ctrl+V works; Shift+Ctrl+V does not.
In Firefox, just a selection does not copy the selected text into the buffer but Ctrl+C and Ctrl+V works just as on any other OS.