have everybody know. that .Edu backlink give 100,1000 or 1000 link with one .Edu domain. can i get PR just have backlink .Edu PR5 - PR7. please explain to me. thanks.
Edu is more for SERP, not PR, but one that has high PR will help yours just like any other high PR page
.edu backlinks provide "link juice" to your site so it will show up higher in the SERP "search engine results pages".
In my opinion, .edu or .com, both carries the same weight. Try to monitor other factors which is more important like: - relevant - total outbound links - link placement (content, footer or sidebar) - is there any bad links on the page? - domain age - page's PR - your anchored keyword - last crawl date - number of back links that particular page received - page load time and more. The above factors delivers more results compared to TLD only. If you are targeting to get high PR, then try to get one way back links from high PR pages which is dofollow.
If the backlinks are coming from relevant websites, then they would have only positive impact and no negative impact at all even if they are coming from .edu domain.
As far as I know you get never punished for the backlinks to your site since the "naturell way" of backlinking is that someone is linking to you, what is totally out of your control. Otherwise you could break your competitors by spamming them with bad links. Only thing that differs is when your backlinking campaign seems strange to the SERPS, e.g. linkfarming.