Can you someone explain techniques of organic search?
There is no any SEO rule. As, according to the search engines every technique that is used to manipulate the search algorithm is unacceptable. Even if it's white hat or blackhat.
Organic SEO means your site get a backlink from the naturally from the users that has no any kind of intention and reward from you. For that way you've to post highly readable and topnotch content on your site that does really worth of your readers time and so they'd give link back from their site/blogs posts.