The first problem is that everybody learns to be a CEO by being a CEO. No training as a manager, general manager or any other job actually prepares you to run a company. The only thing that prepares you to run a company is running a company. This means that you will face a broad set of things that you don’t know how to do that require skills that you don’t have. Nevertheless, everybody will expect you to know how to do them, because, well, you are the CEO.