Succulents generally need full sun to look their ‘absolute best’. (There are specific types like the hanging plants that don’t like much sun). With that said, there are certain things that can impact this. If you buy a succulent from someone who has had their succulents put in full sun all day, then it’s probably best to keep it in full sun. Whereas, If you had your succulent indoors or in the shade and then popped it out in full sun for a day or two. You will most likely see some sunburn on your succies. This is because in having it indoors, it weakens the succulents ability to cope with full sun. So you will have to slowly transition your succulents if you are wanting them in full sun again.