In fact, there are so many things in early education that it is ok to learn by yourself, but theoretical things can be learned, which requires experience and a garden that can provide you with learning opportunities. A certificate is required. Now many parks need to see certificates and your demonstration classes. In choosing a subject, you can learn one, but it will limit your future development. You can start with the subjects you are good at, such as Montessori, Orff, or parenting. A good early education teacher is not a few months' efforts, but a long period of accumulation. Work hard! Good luck!