introductory

adjectives

serving to open or begin

"began the slide show with some introductory remarks"

introductory

is derived from

is similar to

first or beginning

"the memorable opening bars of Beethoven's Fifth"; "the play's opening scene"

serving as a base or starting point

"a basic course in Russian"; "basic training for raw recruits"; "a set of basic tools"; "an introductory art course"

basic, introductory

serving as an introduction or preface

is derived from