here are some keys for you:
1. commenting on other blogs
2. Recognize .edu bloggers
3. If your website provides useful information on a particular subject, then you may use that to get inside a university's resource page. Resource pages are there for linking out to other sites where students can find useful information regarding a particular subject
4. Do some volunteer work
5. Hire college students

It's a BS gimmick that some unscrupulous swindlers try to sell as SEO. Edu links do not help any more than some other link with similar statistics.

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