Imagine you're a really short kid looking up at something really tall, like a grown-up. If you took a picture or video of that grown-up from where you're standing, you would be using a low-angle shot. It's like seeing things from the point of view of a small person looking up.
People often use low-angle shots in movies to make characters or objects look bigger and more powerful. It's also a helpful technique for making something seem more important or significant. So, if you want to make someone look like a superhero or a giant, a low-angle shot is a great way to do it!