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Yes there are ways to perform link building:
1. Social bookmarking
2. Forum commenting
3. Guest blogging
4. Create an RSS feed.

Very first thing you need to do is to optimize your website according to search engine and then you need to start earning the backlinks.

301 redirection means your page is permanently moved and 302 redirection means your page is temporarily moved.

Well aware of the update; It is all because mobile user and traffic from their too is much in trend these days.