EA Cambridge has activities, groups and programmes for many different cause areas. The selection of these cause areas is done roughly according to the importance, tractability, neglectedness framework, as well as the interests of the members of the community. Other frameworks for selecting focus areas can be found here and here.
The goal of this selection process is to find the most promising opportunities for members of the community to have the highest impact and improve the world the most with their actions (including their career, political choices, donations, etc.).
You can find more information on what EA Cambridge currently gets up to and how to get involved with each cause area at the links below. These causes are not representative of all the causes that members of the EA community globally are involved with, or that EA Cambridge will necessarily be focusing on in the future.