How will the redirect affect the search (multilingual site)?

Question

PHP

Hello everyone, how to make it better to redirect the visitor when determining the desired language, and how will the search engines react to this? Use cookies or session? I want to do everything right from the point of view of SEO and according to the rules of PS.

Answer 1

I would leave 3rd level subdomains for additional. services.
And it is better to put the content language after the domain: domain.ltd/en/, etc.
Then the site will be better promoted and the search engines themselves will parse the links. To be precise - use the lang attribute at the beginning of the markup and

<meta http-equiv="Content-Language" content="ru" />

in the header.