First let's start with definitions:

SEO: Search Engine Optimization, SFO: Search Friendly Optimization.

These two things are what most webmasters have trouble balancing. These things seem to always be on opposite ends. On one hand you have to make sure search engines can crawl your website without any problems. On the other you have to keep the site looking good to keep your visitors.

These are all based on what kind of site you plan on making. A corporate website selling shoes in the real world might focus on keeping the site looking good to visitors. And maybe pack it up with flash and all kinds of descriptive images. On the other side a site about online products, e-commerce, might cut back on the images and focus on seo. I will go into both of these just in case.

Let's start with seo. The first thing you need if you choose seo is to meta tags. Now there many meta tags generators out there for a quicker way to make them. But I suggest like me you make them yourself according to the search engines you want your site to better perform at. In short you have to study those search engines and find out how they get their content and what meta tags they require or may find usefull. Mine is based on google so check out the source of the blog and those are the tags that google uses.