To best discuss this topic I should break this down into categories

1. Title Tags

The title Should contain keywords and keyword phrases that is important to your site. Our recommended maximum number of characters for this tag is 60.

Also when counting your characters remember that spaces are considered as well.

Titles should appeal to the reader otherwise even a top position will lose a lot of clicks.

For example, "shoes, nike shoes,best shoes, review shoes," is unlikely to induce a click. What may induce a click would be like: Shoes - Find out the latest styles on name brand shoes.

2. Description

The maximum number of characters I recommend for this Tag is 150. Any longer than this and it will only be cut off and may count against your site being listed high in the search engines. Try to repeat your keywords that you used in your title in a proper sentence and in 3rd party. Avoid I, Me, Myself etc.

3. Keywords

keywords My recommended maximum number of characters for this tag is 250. Any more than that may be considered spamming. Keep your keywords focused upon what your site is about.

Don't think that if I use an assortment of different keywords that your site will be a seller. Targeted marketing is associated with your keywords.

4. Keyword Nesting

keyword nesting is nesting your top 5 most important keywords in the html page that the public will see. I would recommend using the keywords that you've used in your title, description.

5. Head Tags

Head Tags should be a repeat of your title tag. Most webmasters put their head tag right after the body tag.

6. Anchor Links

Anchor Links is one of the most important html tags that your site needs to gain search engine page rank especially in Google and MSN.