They say that DnD heals all wounds. Lay whatever is ailing you on the table and soon enough ye shall be healed through the power of friendship and collaboration. This is what it’s for. Have you ever left a DnD game feeling worse than when you entered it? Probably not. Because if you’re all working together, then nothing can go wrong. Okay, you could be working together and still get a TPK, but that’s probably not your fault. It’s probably that one barbarian’s fault. 

But all to say that collaboration is the key to having a good time. If you’re all on the same page, then everything is easy and nothing hurts. They weren’t joking when they were talking about the magic of teamwork. It really does make the dream work. But that’s not all it takes to create a successful DnD campaign. No, you need a few other things too.