How to shoot short videos at low cost?

Many people have prepared all kinds of photographic equipment, cameras, lights, props and broadcasting equipment since the media came up, and spent a lot of money. Finally, they found that what they really needed was a mobile phone. So for newcomers, start with the simplest things and add them step by step if necessary. Don't think about it in one step. Many friends I know have invested heavily in the early stage, and they all lost their money in the end.