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 engines may penalize sites they discover using black or grey hat methods, either by reducing their rankings or eliminating their listings from their databases altogether. Such penalties can be applied either automatically by the search engines' algorithms, or by a manual site review. One example was the February 2006 Google removal of both BMW Germany and Ricoh Germany for use of deceptive practices.[54] Both companies, however, quickly apologized, fixed the offending pages, and were restored to Google's search engine results page.[55]

Optimizing a website may involve editing its content, adding content, and modifying HTML and associated coding to both increase its relevance to specific keywords and remove barriers to the indexing activities of search engines.[citation needed] Promoting a site to increase the number of backlinks, or inbound links, is another SEO tactic. By May 2015, mobile search had surpassed desktop search.[3]

There are many SEO tactics you can perform on each of your website pages to increase their rank in search engines and get more visitors. This includes producing high-quality content that your audience is searching for, and writing concise meta descriptions for your pages. The meta description appears below your URL in search results. Knowing what a page is about and what will result in a click makes users much more likely to do so. On-page SEO tactics such as these are free, but do take some time. For more help with on-page SEO, check out this blog post: Google Ranking Factors: On-Page vs Off-Page SEO.

I read your post on my mobile phone while on a bus travel and it stirred me due to the fact that I’ve been doing SEO lately the poor man’s way like blog commenting, Social bookmarking, forum signature, directory submission, etc. I don’t know if any of these things still work today since I’ve been practicing them since 2008. These 25 SEO tactics that you have shared got my interest. Actually I am planning to make a new site right now after reading this one. I found out that maybe I’ve been doing a lot of spamming lately that my site is still not ranking on my desired keywords. And also, you have pointed out that it is not just by means of Keyword planner that we will be able to get keywords since there are others like, as what you have said, the wikipedia and the like. I am planning to make use of this article as my guide in starting a new one. I bookmarked it… honestly.. 🙂 And since I have read a lot of articles regarding SEO tips from other sites, I can compare them to your tactics and this is more interesting and exciting. I want to build a quality site that can make me generate income for long years. THANK YOU FOR BEING GENEROUS WITH YOUR KNOWLEDGE. I will try to communicate with you through email and I hope you can coach me Brian. .. please.. 🙂

Spider-driven search engines such as Google®, Yahoo!® and MSN® use "robots" or "crawlers" to score websites across the Internet. Robots "spider/crawl" each site and "score" pages based on how relevant they are. A website's score or placement within a spider driven search engine is derived from hundreds of variables such as link popularity, density and frequency of keywords in page content, HTML code, site themes and more. You will want to focus many criteria in your SEO strategy to position yourself well among the major search engines. Here are two of the most influential factors:
While most of the links to your site will be added gradually, as people discover your content through search or other ways and link to it, Google understands that you'd like to let others know about the hard work you've put into your content. Effectively promoting your new content will lead to faster discovery by those who are interested in the same subject. As with most points covered in this document, taking these recommendations to an extreme could actually harm the reputation of your site.

I consulted a few years ago before Yahoo and CNET and my clients were all small businesses, even friends' sites.  No matter the size of the project, you can still try to get some insight into your target audiences and what they need or want.  I mentioned in a previous comment I used Search once to determine sentiment on a site vs. it's competitors by searching for a feature the site and its competitors all had, along with "like", "love", "hate", "wish", etc.  I also took note of who the people were who said those things and where they were talking (forums, twitter, etc).  It's a hacked manual approach and although not nearly as quality as a good market research report, at least I have a llittle bit of insight before going out to make site recommendations based solely on tags & links.  If you're recommending the site build things that people want (and fix or remove things that they dont), you're more likely to gain links and traffic naturally.
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Black hat SEO attempts to improve rankings in ways that are disapproved of by the search engines, or involve deception. One black hat technique uses hidden text, either as text colored similar to the background, in an invisible div, or positioned off screen. Another method gives a different page depending on whether the page is being requested by a human visitor or a search engine, a technique known as cloaking. Another category sometimes used is grey hat SEO. This is in between black hat and white hat approaches, where the methods employed avoid the site being penalized but do not act in producing the best content for users. Grey hat SEO is entirely focused on improving search engine rankings.