<p>Please read this <a href="http://meta.stackexchange.com/a/10648/205591">post on meta-stackoverflow.com</a>.</p>

<p>The key message is: You have only 16 characters in your title, so don't waste them.<br>
Read the <a href="http://meta.stackexchange.com/a/10648/205591">good/bad examples</a> and look if you agree with them.</p>

<blockquote>
  <p><strong>2. Keep it short.</strong></p>
  
  <p>You don't have to put all the details in the title. There's plenty of space to expand your question in the body of the text.</p>
  
  <p>Likewise, don't insist that your title be expressed as a perfectly
  formed English sentence.</p>
  
  <p><strong>3. Lead with the most important words.</strong></p>
  
  <p><a href="http://www.useit.com/eyetracking" rel="nofollow">These</a> <a href="http://www.useit.com/alertbox/reading_pattern.html" rel="nofollow">articles</a> discuss how people read web pages, based on using
  an eye tracking system to monitor users.
  For Stack&nbsp;Overflow-like pages people read most of the first
  and second entries (the bars of the "F"), and then scan down the
  rest of the list, reading on average the <strong>first 16 characters of each line.</strong></p>
  
  <p><img src="https://i.sstatic.net/NSTjR.jpg" alt=""></p>
  
  <p><strong>4. Don't start with "How do I..."</strong></p>
  
  <p>Writing in that style ensures that you title will fail
  criteria 1-3, and get less attention than it deserves.</p>
  
  <p>This is a question site, and people will understand your titles are questions.</p>
</blockquote>

<p>To be fair: There is a certain amount of <a href="http://meta.stackexchange.com/questions/10647/how-do-i-write-a-good-title#comment19236_10648">people who disagree</a> with this.</p>