For a question you don't want to save. Select text in any app, press the Ask shortcut, and type a one-off question to ask about that text instantly.
Highlight a function and ask "What will this return if the array is empty?" to get an immediate popup answer while reviewing code.
Highlight a specific fact you've written and ask "Is there a more recent statistic for this?" without opening a browser.
Highlight a historical event in your notes and ask "What were the main causes of this event?" to deepen your understanding.
Highlight an acronym in a colleague's message and ask "What does this acronym stand for in a software context?"