Originally Posted by YooHee

directories., classifieds, groups, social bookmarking, i think these are the basics

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these are not basics for seo. directory,article,blog,bookmarking are basic for seo.
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business process outsourcing | BPO services

The basic concept of SEO I know is as follow:
Search Engine Optimization is all about optimizing your blog to rank high in the Search Engine Results and thus increase overall visibility. Apart from unique contents and site design, it’s one of the most important aspects of blogging.
The key to SEO success is persuading search engines that your site is relevant in any search query. SEO is never intended to be a one-time effort. No success can be achieved overnight. It takes a lot of patience, commitment and the know-hows to succeed.
Social networking such as Twitter and Facebook could be good place for one to improve the traffic to their sites. However, as social networking in geneal are only offering no-follow link, if you are looking to promote your PR, you need to combined the use of social networking with article submission sites and social bookmarking sites such as DIGG and Stumpon, etc.

Completely agree with you. Basics are always needed for giving a basic support for a website. Search engine optimization is not an easy task, its very time consuming but yet necessary to get good positing and ranking in search engines. Not only basic but also the further methods are important to get the expected traffic and output.