Location indicator pages in the overall structure web resource.

Calculated by adding a minimum amount to a unit clicks, that the user needs to complete in order to go with main page web resource to the target.

There can be only one page with the first level of nesting on the site - the main one.

The priority in the process depends on the level of page attachment indexation search bots, as well as the likelihood that it will be detected by them at all.

The optimal number of attachment levels depends on the total number of pages on the site. But in any case, it is not recommended that there be more 4 -x UV.