-Not on the same IP’s class series, no rubbish, no FFA, no spam, etc.
-LINKS TO BE ON THE PAGE THAT cached by search engines.
-Links must be permanent and static
-No free for all (FFA),links farms, or any site that seems to have incurred a search engine penalty.
-Directory submission, article submission, blog, guest books, links within forums, links within newsgroups are good but not the best.
-No disallowed by robots.txt or NOINDEX, NOFOLLOW tags.
-Links should be from industry-relevant pages but can be from complimentary audience and services
-Links should have relevant Keywords in the Anchor Text
-Links should not be through a redirect script
-Links should not be through a JavaScript
-Links should not be from framed pages
-Links should not be embedded within a flash
-Link pages should not be excluded in the site s robots.txt
-Link pages should not be excluded by a Robots Tag
-Links should not be excluded by a tag
-Links secured from the site owners should not be on a paid or time-bound basis to ensure longevity
-Links should be spread over different domains
-Links should not be from pornographic and other sites containing offensive content
-No use the Useragent ‘Googlebot’ trick like manipulate Google toolbar.