In Chapter 6, we covered theme development pretty thoroughly, though you can get a much more in-depth tutorial in theme development from the excellent book "WordPress Theme Design", Packt Publishing, ISBN 9781847193094.
This section lists the top template tags and stylesheet classes that you'll want to have if you're going to be developing themes. These are the most essential (with some of my personal favorites thrown in).
Following is a partial list of WordPress template tags. For a complete list, visit the Codex. This is a good place to start: http://codex.wordpress.org/Template_Tags.
In the list that follows, I do not cover the parameters that can be passed to these functions. You'll want to visit the ...