I didn’t know much about WordPress before a friend asked to help out.
It seems pretty simple but there are some things that can trip you up.
WordPress.com is the hosted version. You don’t need your own server for this or need to know much or anything about web development.
You have an admin console where you design your pages and site layout.
WordPress.org provide the tools to create a site, similar to WordPress.com but you host it yourself and is more flexible.
Much flexibility can be added (and bugs fixed) using plugins. These are created and updated by the WordPress community.
I have been helping out with another WordPress site, .com this time.
Check it out at Grape Expectation Tasting
If you are interested in managing your google indexing and ranking have a look at Google WebMaster Toole