Is there a "sticky post" function built into Craft? How would I make a post(s) sticky so that it appears first in the results and does not repeat later in the results?
You could add a custom lightswitch field or similar and order your entries by that field.

{% set entries = craft.entries.section('news').order('myLightswitch desc') %}


If you need additional sort options, @Brad just shared how to do that with SQL in the order() parameter.