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Most old link building strategies are still working, what you need to keep in mind while building links is your anchor text distribution and ratio. Its good to research more about that.

For content marketing, just do it manually. Contact related webmasters and ask them if you can guest blog on their websites, if they accept, do a very unique interesting article.

The good thing about Google webmaster tools is that Google will be re-crawling your website quite more often which is a good thing if you are doing link building on the site.