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Thank you very much for the elaborate answers, this helps a lot

thanks, that answers my question

Hey,

I wonder what the effect of filler words like "on" or "for" is when I try to rank for a certain phrase.

Here is an example, lets say i try to rank for "best apps iphone" but the grammatically correct usage in the headline or text is "best apps for iphone". Is there any difference or should I use the exact keyword without "for"?

Thanks!