Internal SEO optimization article

Create a title of the article - is the most important part of website promotion, after creating the header of all pages (<title>).
How to create headlines for articles, and what is the use of this?

Ideally, this is when the title of the article repeats the title page (or vice versa).
But if the title page is written primarily for SEO promotion, the title of the article should be written by man, since most users only read the headlines, and they skim along the diagonal.