I want to rank in google for three different countries UK, AU and another english speaking country with a .com domain. I read that having back links from each country's domain will help such as getting backlinks from .co.uk domains to rank in google.co.uk, but I'm not sure if this will be enough as there are many .country's extension domains ranking in the first page for the keywords that I want to rank for. So, should I buy a domain name extension for each country I want to rank for. example: buying domain.co.uk to rank in google.co.uk? If so, Should I offer different content on each domain, or only redirect each country's domain to the main .com domain and how to do that? Any answers will be very much appreciated. Thank you.