What Type of Digital Marketing Content is Most Reliable for Earning Natural Inbound Links?

Link building is fast becoming an industry on its own. I believe this is primarily because of the difficulty of earning natural inbound links.

But there are strong indications that Google kicks against link building, which means we, as digital marketers must go white-hart and stick with earning links.

And you'd agree that those links are really precious for the search engines to successfully crawl, rightly index, and present our contents on the SERP's when queried.

So what type of content(s) would you suggest to earns links, and why? Do you have a practical example?

Please share with me.