Joomla 3 add new tab to article manager

Question

This is Joomla 3.3 . I want to add a tab to article add / edit . Basically I want to let user to change the content themselves according to a predefined layout.

Is there any tutorial on this?

EDIT

I want to create a plugin/module/component for article form. Meaning to say that want to add additional info/meta to the article.

Answer 1

You can add custom data to any of the core tables as described at Adding Custom Fields to Core Components (though #__content is slightly different). I've outlined how to do it for #__content at Joomla StackExchange .