This tool surfaces ideas, not metrics. It queries Google Autocomplete — the same suggestion service that drops down as you type in the search box — and returns the completions for your seed term. Those completions reflect things people actually search for, which makes them a strong starting point for topic discovery. Be clear about the boundary, though: there is no monthly search volume, no cost-per-click, and no keyword difficulty here. Any tool that shows those figures buys them from a paid data provider; this one does not, so it does not display numbers it cannot truthfully produce.
What you get is a list of real query phrases. That is genuinely useful on its own — autocomplete is a window into how people phrase their searches, including the long, specific questions that often make the best article topics.