Ctrl-Alt-Shift-V ... Pasting Happiness
If you cut or copy text from an application [especially a web browser] and then paste it into LibreOffice what you often get is formatted text, or at least some approximation of the text's original formatting. This is awful. When using LibreOffice appropriately all formatting is managed via the excellent support for styles. All you want is the text - and nothing about the text. I've used the brute force solution in the past of bouncing my cut-n-paste through gedit. Until I discovered Ctrl-Alt-Shift-V. Yes, all four keys at once. Ctrl-Alt-Shift-V is un-formatted paste [it pastes nothing but the text]. Pasting happiness!