When selecting information from sources to include in your paper, the most important question to keep in mind is:
On what main topic(s) will my paper focus?
These are the ideas you will select from your sources to include in your paper.
Not everything in a source will relate to your paper's topic, so be selective when deciding which information to include and which should be left out altogether.
Because you are being selective about the information you are seeking, you will not always have to read a source fully in order to find support for your argument. Focus on finding the information you need that is directly related to your topic.
Sometimes only a sentence or two from the original source is relevant to your paper.