Here are some of the most effective SEO techniques:
Content Marketing - If you have a website, blogging is one good way of SEO. Always update your audience by giving them fresh and good content.
Keywording - Remember, a good content is the one with good keywords. Add relevant keywords to your article so that it can be optimized easily.
Social Media Marketing - Once you already have your article, you can easily share it on different social media sites for more exposure. In that way, you can gain many backlinks to your website.
Submitting your article to different bookmarking and directory sites are also good strategies of SEO.