There is no evidence adding a keyword two or more times to a title tag increases the title tag SEO benefit for that keyword.
For this reason it is advisable to only add a keyword once unless it makes sense from a user or keyword proximity perspective: for example for keyword proximity reasons a title like “SEO Tutorial – SEO Title Optimization” could be better than “SEO Tutorial – Title Optimization” IF your main SERP is “SEO Title Optimization”, but you also want your potential search engine visitors when viewing a Google SERP to know the page is an SEO Tutorial.
As a general rule of thumb when it comes to the title tags less is better than more as it concentrates the SEO benefit of the title over less keywords.
That being said it’s 2018 and Google has been around a long time (it’s indexed billions of web pages) and for some competitive SERPS you do not stand a chance of ever ranking even in the top 20 let alone the top 5 where the money is.
It’s highly unlikely this site will rank high in Google for the one word keyword SERP: SEO.
Since it’s unlikely this site can rank for the single keyword SEO, it would be a waste of SEO resources (link benefit etc…) to target a webpage at the SEO SERP: be realistic with your SEO goals.
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