Drupal 7.x

Hi,
I'm just working with drupal 7.
I'm trying to print the body field in my own node.tpl.php
I can print it like this:
print $content['body']['#object']->body['und'][0]['value'];
But i think this is not the way.
I wanne have something like this. render($page['content']['body']) or render($content['body']) or just $body.

Does someone knows what the correct/short way is to to load the body field into your node?

hiii..

how would I use php and mysql to get some values from database when I define the structure of the content type of some field?
say I want to make categories and subcategories, and I want to connect the subcategories with a select field parent to choose from.. how do i do this?

I definitely want to modify the drupal theme, I am using zen.
For example, if I want to render link user/login, I think I should do:

Login

Which render user/login with lightframe.
But the thing is, which file should I add this line into??? page.tpl.php??? Who is responsible generating the HTML file???

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