<p>For the UI, the following options come to my mind:</p>

<ul>
<li>from the search results, linking to a cheat sheet (example: <a href="https://github.com/search?utf8=%E2%9C%93&q=help">https://github.com/search?utf8=%E2%9C%93&q=help</a>, <a href="https://cloud.githubusercontent.com/assets/782446/9479108/04408050-4b7c-11e5-83fc-17c9ad4bde2f.png">screenshot</a>)</li>
<li>show a hint ("do you know already?") in the search results (example: <a href="https://duckduckgo.com/?q=wiki+osm&ia=about">https://duckduckgo.com/?q=wiki+osm&ia=about</a>, <a href="https://cloud.githubusercontent.com/assets/782446/9479139/2c17edca-4b7c-11e5-9f19-6ca6895d669b.png">screenshot</a>)</li>
<li>show a tooltip in the search box (example: <a href="https://geizhals.eu/?cat=cpu1151">https://geizhals.eu/?cat=cpu1151</a>, 
<a href="https://cloud.githubusercontent.com/assets/782446/9479158/40e716a4-4b7c-11e5-88af-2d2caf26c703.png">screenshot</a>)</li>
</ul>

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