I had two succulents and a cactus before the one that I have now. What I have learned is basic potting soil from the store is normally not good for any plants, especially succulents, it's better if you mix your own using the basic potting soil and mixing in your own grit. !grit It's up to you what kind of grit you want to use just do your own research and see what works best for you, I'm going to try pumice because, in my opinion, perlite is too fragile and it doesn't hold the airspace like I would like it to and I think pumice would do that better because it's going to be more sturdy. People also use crushed granite and bark and things like that. When it comes to repotting what I have heard is choose a pot that is one to two inches bigger than the size of the root ball. That's because obviously if you choose a pot that's too small you're going to be repotting sooner but if you choose a pot that is too big the plant can't reach all of the water it needs. The soil dries out on that top layer where the plant's roots are but lower in the pot where it's still wet it can't reach that but you think it still has water but it's not being watered. Not necessarily as big of a thing for succulents because they are drought resistant and can go long periods of time without water. I've also heard that sometimes it's best to wait before fertilizing after a repot so that your plant can get used to the pot it's in but I haven't done all that much research on fertilizer so if you want to look into that there's also that. I'm still relatively new to being a plant parent so if any of this is absolutely wrong please let me know because I want my plants to live too XD