This tutorial explain how to rewrite adminhtml form magento. The tutorial show how to extend magento extension admin form and add new form fields as shown below.
Also refer the tutorial explains how to tables upgrade script and create magento admin grids.
This tutorial explains how to import grouped products magento.The products data are importing from the CSV.
This tutorial explains how to upgrade script multiple columns magento. The code below show to add columns to existing custom table magento module.
Please also refer other magento tutorials and how to create custom tables magento installer script.
This is a free facebook pixel magento extension.The extension add facebook pixel code to the magento website.It also provides to option set advanced facebook pixel from magento backend.
This tutorial explains how to export import blogs shopify API. Using Shopify API data can be export from one store and import to another programmatically.
Please refer other PHP tutorials