The sole purpose for a background guide for delegates, is to provide them a sense of direction about the topic and shall help you research much better about the topic. But do make a note that background guides do not exist in real UN conferences ans thus referring them in your speeches would not really help you.
To help you understand, try to compare background guides to wikipedia pages that provide you a summary of the issue and its past. The guides don't really offer a great deal of insight and depending on them may actually put you behind in the committee.
What you can really learn from the background guide is a general overview of the conflict which can help you to know where you stand in the issue and specific topics that you can shed more light into by more researching.