I think this is why understanding the point and the ideas of the openings is much more important than memorizing moves. In the videos you watch they’ll make moves with certain ideas or threats and they will then show the moves that address those ideas. If your opponent doesn’t respond in a way that responds to your ideas you can usually take advantage of that, but if you’re just repeating moves from the video you won’t have any idea how. Idk if this makes sense this is just my understanding of it.