How to identify search query parameters for your site?

How to identify search query parameters. When users search your site, their queries are usually included in the URL. For example, if you use Google to search the phrase Mountain View, you see q (Google’s query parameter) followed by your query: http://www.google.com?hl=en& q = mountain+view … If your site uses categories, then …
For More Information Please Refer:
https://support.google.com/analytics/answer/1012264?hl=en
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