This tutorial shows how to add a custom select list in configuration settings of a custom Magento module.
Suppose, your module’s namespace is YourNamespace and your module’s name is YourModule. And, you want to add a selection list of Brands that contains mobile brand names like Samsung, Sony, Apple, etc.

When you share a link of your page on Facebook, you may notice that Facebook is fetching images from your page. If there are multiple images on your page then you can have option to select the image to be displayed on the shared post. Sometime an advertisement image might be displayed as the first image while sharing link through Facebook.
Generally, when people share a link, they don’t bother about choosing the right image, editing title or description. They will just paste the link and hit the post button. …