I have a question. If i have a website aaa.com with pagerank 0 and another website bbb.com with pagerank 3, and I decide to do a redirect 301 from aaa.com to bbb.com. What will happen to bbb.com's pagerank? it will decrease? Please help . thanks
It won't decrease, but if you redirect the other way around ....your aaa.com will get all the link juice that was flowing to bbb.com.
Nothing, what will happen is all indexed URLs will be redirected to the new domain name, also passing on any link value\pagerank value they currently have. In a sense, if you do have backlinks it will benefit your site.
i have written an blog post about it that what to be used and what is the difference: Do read about 301 redirect on my blog visit here Hope it helps...