Transferable skills are abilities that can be useful in more than one setting, such as organizing information, explaining a process, coordinating people, or noticing problems. Whether they transfer well depends on the new context and any additional knowledge it requires.
Choose one thing you do regularly and describe the underlying activity. Managing a busy appointment schedule, for example, may involve prioritization and communication. Then investigate where similar activities appear in another role. That creates a connection to explore, not proof that you already meet every requirement of the new job.