There are three types of Meta Tags
1.    Meta Title
2.    Meta Keywords
3.    Meta Description

Meta Title – When you choose Meta title then you should not use much keyword in Meta title. You can use your one keyword and two keywords in title tag. You should use also “|” pipe sign for separating your essential words in title. You should not use more then 70 characters in title.

Meta Keywords – You should take essential keywords in your Meta keywords section. Your keywords should not more then 10 keywords.

Meta Description – Use only 150 characters or less in your description. Your description should not have huge keyword stuff. Your Meta description should be unique and tell your site story in one line and your language should be readable for search engines.

You should use different Meta tags for different pages. You must not keep one Meta tags for all pages of your site. You should give 2 minutes only to your Meta tags always. You can also include your name, category, prices and other information in you Meta Tags. It can target more results for your site. It is really very good for getting high visitor by giving one two minutes to Meta Tags.

DMOZ.ORG is very essential for Meta Tag Optimization. If you desire to optimize your site in search engine rankings then you must place your site Meta Tags in dmoz. Google takes your site Meta Tags from dmoz.