SEO is an acronym which stands for Search Engine Optimization. The folks at HubSpot have a fun GIF which provides this definition,
“It refers to strategies and techniques to help a website rank higher in search engine results. . . . the core goal of SEO today is to address the questions your audience is searching for.”
Sometimes it is best to go straight to the experts for tutorials and guidance. I’m recommending that path for this post. The owner and writing staff at WPBeginner are a wealth of knowledge and detailed step-by-step instructions. They have been one of my favorite sources.
Follow this link for a complete written and video tutorial that will walk you through setting up Yoast WordPress SEO. Follow Steps 3 through 8. Steps 9 and following are optional.
For an alternate tutorial in an infographic format, view this post at QuickSprout.
To understand what SEO means and why you should care, check out this article from Kissmetrics.