In addition to helping you find keywords you should be bidding on, thorough keyword research can also help you identify negative keywords – search terms that you should exclude from your campaigns. Negative keywords aren’t terms with negative connotations, but rather irrelevant terms that are highly unlikely to result in conversions. For example, if you sell ice cream, you might want to exclude the keyword “ice cream recipes”, as users searching for ice cream recipes are unlikely to be in the market for your product.
In 1998, two graduate students at Stanford University, Larry Page and Sergey Brin, developed "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links.[22] PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer.

Search engine optimization (SEO) is the method website owners use to help search engines find, index, and rank their web pages, hopefully above competitors' websites. While there are several search engines you can rank on, including Bing and Yahoo, the majority of Internet search (80%) is done through Google. As a result, most SEO tips you'll come across are geared toward getting noticed and ranked by Google. 

Deliver value no matter what: Regardless of who you are and what you're trying to promote, always deliver value, first and foremost. Go out of your way to help others by carefully curating information that will assist them in their journey. The more you focus on delivering value, the quicker you'll reach that proverbial tipping point when it comes to exploding your fans or followers.
Inbound marketing refers to a marketing methodology wherein you attract, engage, and delight customers at every stage of the buyer's journey. You can use every digital marketing tactic listed above, throughout an inbound marketing strategy, to create a customer experience that works with the customer, not against them. Here are some classic examples of inbound marketing versus traditional marketing: