So enough of these scary stories. Google actually likes backlinks and relies upon them. The whole idea behind them is that they help to tell Google what is good and useful out there. Remember, it is still an algorithm. It doesn’t know that your page describing the best technique for restoring a 1965 Ford Mustang bumper is all that great. But if enough people are talking about how great it is, and thereby referencing that page on other websites, Google will actually know.
In this illustration from the “PageRank Citation Ranking” paper, the authors demonstrate how webpages pass value onto other pages. The two pages on the left have a value of 100 and 9, respectively. The page with a value of 100 has two links that point to the pages on the right. That page’s value of 100 is divided between the two links, so that each conveys a value of 50. The other page on the left has three outgoing links, each carrying one-third of the page’s value of 9. One link goes to the top page on the right, which ends up with a total value of 53. The bottom right page has no other backlinks, so its total value is 50.
SEO should be a core tactic in any marketing strategy. While it might seem difficult to understand at first, as long as you find the right course, book or audiobook, and devote your time to learning, you'll be in good shape. Considering that there are over 200+ ranking factors in Google's current algorithms, learning, digesting and successfully implementing good SEO tactics is essential to the success of your website or blog.
As Google becomes more and more sophisticated, one of the major cores of their algorithm, the one dealing with links (called Penguin) aims to value natural, quality links and devalue those unnatural or spammy ones. As a search engine, if they are to stay viable, they have to make sure their results are as honest and high-quality as possible, and that webmasters can't manipulate those results to their own benefit.

A strategy that is linked into the effectiveness of digital marketing is content marketing.[39] Content marketing can be briefly described as "delivering the content that your audience is seeking in the places that they are searching for it".[39] It is found that content marketing is highly present in digital marketing and becomes highly successful when content marketing is involved. This is due to content marketing making your brand more relevant to the target consumers, as well as more visible to the target consumer.
For Search Engines, backlinks help to determine the page’s importance and value (i.e. authority). Historically, the quantity of backlinks was an indicator of a page’s popularity.  Today, due to the way backlinks are evaluated based on different industry-related ranking factors, it is less quantity focused and more about the quality of sites from which the links are coming.

9. Troubleshooting and adjustment. In your first few years as a search optimizer, you’ll almost certainly run into the same problems and challenges everyone else does; your rankings will plateau, you’ll find duplicate content on your site, and you’ll probably see significant ranking volatility. You’ll need to know how to diagnose and address these problems if you don’t want them to bring down the effectiveness of your campaign.

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