What are best page titles for sub-domain pages?

[vtmoz]

Hi Moz communtity,

Let's say a website has multiple sub-domains with hundreds and thousands of pages. Generally we will be mentioning "primary keyword & "brand name" on every page of website. Can we do same on all pages of sub-domains to increase the authority of website for this primary keyword in Google? Or it gonna end up as negative impact if Google consider as duplicate content being mentioned same keyword and brand name on every page even on website and all pages of sub domains?

Thanks

[vtmoz]

It seems you didn't get my question. There will be no duplicate content in pages. All I am discussing is about how to optimise sub-domains pages with "keyword" and "brand" at page titles. Generally we have given "brand & keyword" in all pages of website. Can we do same for pages of sub-domains? Is so many pages added with "brand & keyword" helps or kills in ranking?

[Hurf]

A site can have multiple sub-domains with as many pages as you like and Google can crawl them, but that doesn't mean it will index them. If you are deliberately producing duplicate content (and that includes slightly re-worked content to include a keyword variation) across your site, Google are going to penalise you for it:

"Duplicate content on a site is not grounds for action on that site unless it appears that the intent of the duplicate content is to be deceptive and manipulate search engine results"

Source: Google Search Console Help -  Duplicate Content: https://support.google.com/webmasters/answer/66359

You'd benefit far more from 100 pages, filled with exceptional content than a 1,000,000 pages full of zero-value, duplicate content.

Don't just build content that focuses on one keyword, either; instead, build a page around a keyword "theme" and use synonyms that you'd expect you use naturally (i.e. in conversation with a human being), referencing your main keyword a couple of times, near the top of the page and in the title at most - don't plaster it everywhere). Google is smart enough to deal with synonyms - and with the arrival of Google's RankBrain (https://en.wikipedia.org/wiki/RankBrain) even more so. Readers hate keyword-stuffed pages as much as Google do and both will punish you for using them.

Less is more. Invest your energy in the user's experience, instead.