Watch this video. Every time you feel you are confused, just pause and rewind the video and rewatch it. Do this until the video makes sense.
Can’t do it can you? It doesn’t matter how much you pause and rewind a video, if it doesn’t make any sense to you, watching it again isn’t going to suddenly change the video so it makes sense.
One critical job of the teacher is to find out where students are, and help them at that stage. Explanations that don’t make any sense aren’t particularly helpful. In fact, since our goal is to help students learn the mathematics, and not just the words that represent the mathematics, explanations may not be helpful at all.