For questions about built-in search functionality of this site and about searching this site using external search engines.
Often maligned, but often helpful, search helps you find things already asked.
Content copiers and scrapers
For a glance at if your question has already been asked (and most likely it has) be sure to make use of the search.
The plus (
+) modifier works well here in refining your results. For example, you have a question about a donkey and fetching water. The search you start could be something like:
For more search tips, visit the Advanced Ninja Search page.
Elasticsearch powers the search used on Stack Exchange sites.