How to correctly set rel="canonical"?

Question

Search Engine Optimization

How to correctly set rel="canonical"
On a site with subdomains in 2 cities
nsk.hookahslab.ru
barnaul.hookahslab.ru

Answer 1

It all depends on the promotion, how you position these two sites
. also available by urls:
nsk.hookahslab.ru/index.php
www.nsk.hookahslab.ru/index.php
this is solved by editing .htaccess if the site is running on Apache), you can specify the url of the main page in this tag
2) since search engines consider subdomains as two different sites, the difference between these two sites is the phone number of the city and maybe the address, which is also not good, and here you can glue them together by pointing to all in canonical one of some kind, or really a small chance, but nevertheless, you can get pessimized both for a double and for an affiliate - but as I understand it, it will advance contextually, so you probably don’t need to worry about the loot defeats evil