The teacher should recycle his knowledge and practice of teaching and making his students learn.
The teacher can study some essay on education, for instance. The way of studying could be reading carefully and with attention, keeping the main important points of the text, and making a summary with those main points, either by writing them or mentally.
This is a way adults may implement learning in their personal studying. The teacher should keep on learning and revising, if he wants to effectively teach. / Photo from: skiing www bocatc org. the picture is an illustration, just that