XRD is a characterization technique that will describe the structure of your solid. You can at first, determine if it's an amorphous or crystalline material. Reminding that crystal is a solid with ordered periodic atomic structure, and amorphous is a solid without periodic ordered atomic structure.
When you get an amorphous solid, we generally cant describe any further with XRD. But if your compound is a crystalline solid, it is obligately described as one of the 7 crystal systems, and its subdivisions. This is the point of interpret an XRD pattern, you will be aware of the atomic structure of your solid.
This is a quick explanation, but feel free to ask more about this topic.
We do XRD of any material to know about its structure, i.e. if its crystalline or amorphous. If its crystalline it will show sharp peaks at certain 2theta values (depends on your material) and if its amorphous it will show a hump. Now, you need to compare your data with the available literature of your naterial. You can assign or find the the crystal planes that contribute to the peaks of your sample. You can fit your data to obtain the the FWHM values of the peaks and ultimatey you can calculate the crystallite size of your samples using Debye-Scherrer equation. Hope this helps. Cheers !!!
Since "Elucidate is a verb that means to make something clear that was formerly murky or confusing," how you can do that depends on what you are unclear or confused about. Before doing any experiment, you should specify what you seek to determine. And before we can help you, you need to share with us what you hope to determine. XRD can be used to measure many things, and it's a waste of everyone's time to tell you how to use XRD for determining things you don't care about.