How do I add Meta Description & Meta keywords to my wp blog? what is robots.txt file? How do I add this file to my blog? What are Microformats and Dublin Core? Is it good to add Geo Meta Tags to wp blog?
Lot of questions and we will need a book to explain all that so we will make it as easy as we can ! For wordpress there is a bunch of SEO Plugins, Try Yoast SEO Plugin or All In One Seo Plugin, Follow the Steps and you Will have the Ability to add a Description / Keywords and Robots.txt. Concerning your question about Microformats, Read : Link Concerning the Geo Meta Tags that can be useful, all depend about your Websites.. if it's for Business so it's very useful... Goodluck
Referring to your first question, i use these plugins: Meta Keywords Generator and SEO Meta Description