Succulents can be easily overwatered which can lead to root rot. Water your succulents only when they are dry.
Succulents need natural sunlight to stay healthy so make sure to choose a bright location.If placed in full sunlight, watch the leaves for burning if the light is too intense. However succulents can adapt very well to new locations.
If repotting, use a fast draining soil mix. This will prevent the development of root rot.
Fertilize if the color seems off or is too yellow.