Costly Link Building Mistakes

1 Check if back links have a “no follow” attribute
2 Getting good quality links but with useless anchor texts
3 Getting an image link (when a text link with keyword is possible)
4 Not using ALT text if image link is the only possibility
5 Getting back links from irrelevant websites
6 Getting back links from sites/pages with tons of links
7 Links from pages spiders can't crawl
8 Explicitly selling links
9 Linking to sites with poor reputation
10 Linking to good sites gone bad

These are the big mistakes. There is no use of a link if its anchor texts is not your keyword or useful text.
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Having bulk Paid links also of no use,Google may be consider site as spam.

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