A good contract is the only thing that protects a freelancer when a project starts to go wrong. I always make sure that the document clearly states exactly what I will do and what happens if the client asks for extra work later on. Many beginners forget to include a section about how they will be paid or who owns the final design once the job is finished. Without these details, you might face a lot of arguments. In your experience, what is the most important clause to include in every agreement?