Description tag on the site; some resources do not have one as such. Unlike the title tag, which must be the title of the page. I do a lot of poking around in the source codes of sites, and I noticed a trend in which they put micro markup and the description tag is completely missing.

Promotion experts have been arguing for a long time that Google itself takes what it needs from the text of the page and therefore description is optional. Others believe on the contrary that everything should be there. As for me, the description should have meaning, for example, if this is an article, then the description may look like a headline or the like. Now there are tools in various website builders that help you do all this automatically.

Static pages on resources can have their own title and description. There is a rule that says that the title is no more than 100 characters and the description is 300. Although even here there is a lot of arguing about counting half of what was said. Well, the words from the above must be in the texts of the pages. And don't repeat yourself too often.

Forming the structure of headings, here you need to be careful with nesting pages into each other like steps. So, because of this, there may be incorrect indexing. Personal opinion is that almost every page should exist on its own, connected only with the main page. An example of steps is when several or more more are put into categories of something.