Context is a design input
A useful classroom product begins with the board, language, available devices and time a teacher has. These are design constraints to understand early, not details to solve after the product is finished.
Let formats cooperate
A printed activity may work better for discussion. An animation may make a process easier to see. Digital delivery should support those choices and keep the learning sequence coherent.
Design a fallback
Consider what happens when the network fails, audio is unavailable or a shared display is difficult to read. A printable explanation or a clear static frame can preserve the lesson.
Close the loop
Ask teachers what they skipped, changed or explained again. These observations help improve both the content and the system that produces it.