Succulents need a free draining soil mix. Plants don’t like being too wet so keep on the dry side, the best method is to soak periodically letting the mix dry completely between waterings. They will be happiest in full sun to partial shade but avoid drastic changes e.g. in a south facing window in summer. In winter put them in the brightest window in your home. Remove any dead leaves from the base of the plant as they can be a haven for pests or fungal disease which may kill the plant.