I strongly recommend a book "X-Ray Diffraction A practical Approach" by C. Suryanarayana and M. Grant Norton, if you are looking for basic approach to analysis XRD. In this you will find many example which you have to solve for learning basic approach behind XRD analysis.
And also a book by Cullity for build up your concept.
P.S. I suggest you to go first with suryanaryana then after Cullity
Use Xpert High Score software to analyse your sample, tutorial for this you easily find at youtube.
I think for beginners it may be a little difficult to analyze the XRD data. But it is very simple. With more study and experience, you will be friendly with this powerful and most essential characteristics tool. I would like to suggest you to read some basic things which would be very helpful to you. Please follow the below link.
The texts listed by others are good. Cullity was used back in the 70s, but is still valid. Assume you have access to an X-ray diffractometer. Recommend you get some alumina (aluminum oxide) powder and generate a pattern. You'll need to learn about Bragg's law, and calulate d spacings. You'll need a catalog of materials/ d spacings you can get on the IN. It won't take you long to get the basics; but, the tool is much more powerful than for just material identification. Good luck. Learn by doing!