Hi Guys, I've read a lot of things about 301 redirection link building. I have a site which is related to dental and machines,what if I find an expired domain related to same niche and redirect it to my dental site. Is it safe? What factors I should keep in my mind while doing 301 a domain to my site? What point should I check when buying an expired niche related domain? If is their any tutorial let me know. Thanks!