Tags are where a search engine looks, and a page carrying none gets walked past no matter how carefully the writing was optimised. That holds the traffic posts together here, and it comes with a short explanation of the tag types, beginning with the title tag.
The companion piece on web crawlers addresses somebody who has heard the term and never had it explained. Knowing what a crawler is doing changes what you bother to do to a page, which is a better reason to learn it than passing a quiz.
A post on writing a solo advertisement makes a fair complaint. Almost nobody thinks about the writing itself, and the writing is the entire thing being bought. The advice concerns the words rather than where to purchase the placement.
A piece on staying on task, and one on why plenty of owners never reach the goal they set, fill out the rest.
Start with the tags post. It takes ten minutes and explains why some pages never appear at all.