Identifying Blogger's gadget (or element) ID is important when it comes to tweaking your blog. This is because most Blogger tweaks involves CSS styling (emphasize on 'most'). In order for you to style an element using CSS code, you'd have to address that element first. And it will not be possible if you do not know the element's ID or class.
Here comes another question, what is an ID and what is a Class? This question tangential to what is being discussed in this tutorial, but for the sake of simplicity, you'd only have to know that an ID is a unique identifier used to address ONE specific element in a page, whereas a class is an identifier that can be used to address few elements as whole. All 'built-in' gadgets in Blogger can be addressed using IDs. So knowing an element's ID will allow you to apply CSS styling on it. Common tweaks that are applied to these gadgets are margin-reduction, repositioning, resizing and even hiding an element completely from a given page.
In this tutorial, I will share with you two methods on how you can identify your Blogger's elements' IDs. The first one is a straight-forward method, recommended for beginners. The second method is also straight-forward, but you'd have to install an add-on for it. Opt for the second one if you're gonna be finding out your element's IDs or classes frequently.