One of the principle advantages of WordPress is that you are in control. Unlike remote-hosted scripts such as Blogger and LiveJournal, you host WordPress on your own server. Installation is very simple,
What is The WordPress Loop?
The Loop is PHP code used by WordPress to display posts. Using The Loop, WordPress processes each post to be displayed on the current page, and formats it according to how it matches specified criteria within The Loop tags.
I don’t know what all the WordPress terms mean: where can I get help?
The WordPress Codex has a Glossary where you can find definitions of many of the key phrases associated with WordPress.