What material to read about creating a subdomain?

All images will be on a separate subdomain to speed. I can't create a subdomain, because I can't find good documentation. Yet testing on a local hosting(I use Open Server).
July 9th 19 at 10:49
2 answers
July 9th 19 at 10:51
Solution
If your subdomain will be located on the same server, then no acceleration you get.
Acceleration can be if put in front of apache and nginx catalogue with the statics give by means of nginx without recourse to apache.
A must read lib.clodo.ru/web-%D0%A1%D0%B5%D1%80%D0%B2%D0%B5%D1...
Or anything according to "nginx apache".
Not in all cases - but there are!
Read about: Parallelization of content. - Buck.Walter commented on July 9th 19 at 10:54
July 9th 19 at 10:53
Solution
Parallelization is a good thing, but it is necessary to begin not with it.
What's your WEB server?
If it's Apache - go to the Nginx or Apache(backend, PHP) + Nginx (frontend, for static files).

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