Magento, Magento Checkout, Magento Helper

Magento Helper Override/Overwrite

Magento, Magento System Configuration

Create your own tab in system configuration in magento

Magento, Magento System Configuration

Add third party trackings in Magento

Magento, Magento Layout

Easy way to find block class name in phtml

Magento Events, Magento Observer

Get the list of events from any version of magento

Magento Events

Events/Observer cheat sheet for Magento – Applies to version 1.7.0.0

Magento Admin, Magento Controllers

Create new Admin Controller in Magento

Magento, Magento Layout

Static Block in Magento

Magento, Magento Order, Magento System Configuration

Magento 1 : Add Order Status in system configuration