SEO started when the World Wide Web became active and search companies began to categorize, index, and rank websites and blogs. In the nascent stage, search companies were developing their ranking algorithms.
Initial algorithms were raw and were accepting a lot of spam. They placed a lot of emphasis on keywords on the site and links. The links were those pointing to the site also known as inbound or external links.
Webmasters resorted to keyword stuffing, and link building to rank high on the SERPs.They got away with it. Nowadays, search engines are more sophisticated, and some of them employ over 200 metrics to index and rank a website. Some of the metrics are known, while many remain hidden for search engine optimization consultants. The practice thus includes search and analysis to discover what works the best.
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Comments
There is no nondisclosure thing. Webmasters have to analyze extensively to promote their sites. You can work for a digital marketing agency or go freelance. In India, the pay scale for an experienced consultant would be up to Rs.3000 thousand.
The fourth sentence in your third paragraph mentions that "Some of the metrics are known, while many remain hidden for search engine optimization consultants."
Search engine optimization consultants must have to sign non-disclosure agreements, wouldn't you think?
There must be little turnover in such positions. It seems that so little is known about search engine optimization metrics.
But would it be known how one becomes a search engine optimization consultant and what the benefits and pay would be?
SEO directories are just the same a link farms with no authority and search now ignore directory submissions.
The second sentence in your second paragraph to the last subheading, Understanding SEO Off Page Optimization, indicates that "Webmasters should avoid building links on SEO directories but local listing and business directories are fine."
I understand why the third-sentence precaution "Avoid link farms when building links" warns against what would be problematic.
But why would "building links on SEO directories" be problematic?