When using keywords such as in tags such as a tag, does Google recognize / ignore repeated words and recognize only the unique words instead, and correlate those for organic searches?
For example, if I want to sell books online in Canada, I may have a tag with keywords placed in it for common Google searches, including phrases as some of the following: "Sell textbooks online, Sell textbooks Canada, Sell books Canada, Sell books online, Sell used textbooks online, sell used textbooks Canada, Sell used textbooks online". (I understand this is over the character limit, but these phrases would be placed throughout the site and in other tags.).
Is all the repeated words such as "sell, book, textbook, Canada" redundant, with only the unique words actually being necessary?
Instead, would it be wiser if I just put: "Sell used books & textbooks online in Canada" where all the keywords are present in the same sentence, where words dont need to be repeated for each exact phrase.
Please dont reply saying this doesnt matter and only quality content matters for SEO, this is not answering my question.
I am not referring to meta tags though, im aware they're ignored, im referring to markup tags such as , , , . Putting keywords in these are valuable and looked at by Google. I've also read in "SEO Fitness Workbook, 2016 Edition: The Seven Steps to Search Engine Optimization Success on Google", is actually used by Google for SEO, despite many saying its not, just being ignored and being used more for a "note to self".