How to create a Hello world extension in Magento? [closed]

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I would like to create my first Magento extension, is there any tutorial about "Creating simple Hello world extension" for Magento. In mean time if i find any such tutorial in Google, I will post in this.

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Here is a simple Hello World module creation tutorial:- http://magento4u.wordpress.com/2009/06/08/create-new-module-helloworld-in-magento/

Furthermore, you can use module creator for easy and initial module setup:- http://www.magentocommerce.com/wiki/5_-_modules_and_development/0_-_module_development_in_magento/custom_module_with_custom_database_table

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For beginners the best one out there, is this article from Smashing Magazine: http://coding.smashingmagazine.com/2012/03/01/basics-creating-magento-module/

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1. Declare your extension in app/etc/modules
2. Put PHP code in app/code. which directory you can declare in your Company_Module
3. Create layout in app/design/frontend/default/default.