Example: page that describes 10 sightseeing of the city. I've put each one to the tag: https://www.best-of-copenhagen.com/en/visit-copenhagen-in-1-2-days
But now I am not sure that it is a correct thing. What should I use to divide them? Section - no... I need put them in some element, if article is wrong - I'll use just for styles.
The article tag specifies independent, self-contained content.
Your page is an
article which contains multiple
section tags (chapters). What you did is you put your article inside a
More info here.