Walter Goodman was someone who watched movies and TV shows, like the ones you might watch on your screen at home. He would then write his thoughts and opinions about these movies and shows for other people to read in newspapers or magazines.
Sometimes, he would say that a movie or show was really good, meaning that he liked it a lot and thought that other people might like it too. And sometimes, he would say that a movie or show was not so good, meaning that he did not like it as much and did not think that other people might like it either.
People would read his reviews to help them decide if they wanted to watch a certain movie or show. If Walter Goodman said it was really good, they might be more likely to watch it. But if he said it wasn't very good, they might decide to watch something else instead.