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I changed my home page title tag to a two word phrase which matched the domain name(down from about six words), Results：ranking for that phrase dropped from page2 to page8. what is the reason for that? Does Google dislike changes in title tag?

For on page SEO, I always wondered which way is better to put text link.( do not mean the link in the artical) eg: the anchor text is black hat world, it is better to put as : black hat world(internal link) black hat...