instructional
adjective uk/ɪnˈstrʌk.ʃən.əl/ us/ɪnˈstrʌk.ʃən.əl/
教学的，指导性的;教学用的
(of an activity, book, etc.) designed to teach someone how to do something
He taught himself the sport by watching online instructional videos. 他通过看网上的教学录像学会了那项运动。