<p>I have seen several questions asking for references that someone (or more than one) has marked as too broad.  E.g. <a href="https://stats.stackexchange.com/review/close/190889">https://stats.stackexchange.com/review/close/190889</a> asks for references about using machine learning to build a trading portfolio.</p>

<p>I fully agree this would be too broad if the OP was asking for a <em>solution</em> to the problem, but he/she is not; they just want a place to get started. </p>

<p>I don't see how this is too broad, but perhaps I am missing something. </p>
