DIDACTIC

intended to teach or instruct

/instructive (especially excessively)

//intended to convey instruction and information as well as pleasure and entertainment
"didactic poetry"

"It was a didactic piece of artwork, and it was clear exactly what the artist was trying to teach."

"At first glance he was struck with joy by this artful, didactic work, but after further look into what exactly the work was instructing he changed his opinion."

"He had a very didactic approach to directing which usually resulted in actors becoming much better after having worked in films with him and even sometimes by the end of films."