This is the 17927th most frequent Russian word.
учебную
The Russian word "учебную" means "educational" or "study-related" (accusative singular feminine form).
In this sentence, "учебную" is an adjective describing "программу" (program), referring specifically to its educational purpose.
Настя готовит учебную программу для нового курса.
Nastya is preparing an educational program for the new course.
Here, "учебную" describes "литературу" (literature), indicating its function as study-related material.
Он купил учебную литературу для подготовки к экзамену.
He bought educational literature to prepare for the exam.
In this context, "учебную" is used to specify that the board has an educational purpose for classroom use.