Mikael Häggström [note 1]
Strive to always begin with the real life situation in which the point you want to teach is relevant for improving the management of a patient. If you can't think of a situation where something would relevant, generally don't teach it. Also, present them with all pertinent information that you can readily look up or ask from fellow trainees.
If possible, teach by giving students tasks from real cases and present to you what they would do. Until you know a student better, assume that the person is uneducated enough to need to ask or look up how to do something, but at the same time smart enough to only study what is needed to perform the task, so a greater responsibility means a greater need to study.