This link is provided by the bio box that article directories allow you to add to your article. You can provide a link back to your web site, or even better is a link back to a page within your site, and that is available to every reader of your article to click on and be lead to your site. That also provides you with traffic, and this is compounded by all of those who copy your article to their own web site. Consider the possibilities.
The next best technique is probably to optimize your site for search engines. This has to be done from the site design stage since it is difficult to take a badly designed site and optimize it to any effect. A web site should be designed, not as a maze for search engines, leading them to blind alleys and links that take them away from your site, but as a simple path with sign posts leading them from A to B. This takes knowledge of how spiders crawl your web site and how not to force them to read content on your home page that confuses them and so down-lists you.
SEO is a skill and not something that can be passed on in an article such as this. Briefly, however, spiders crawl left to right, from table one to table two, via each column and row in each table first. Arrange your web site so that the main content is read first using these principles. The same applies to CSS style: always left to right, table to table.
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