There are hundreds of ways for a teenager to make money nowadays. The opportunities the internet provided significantly increased the list of side hustles available for both teenagers and adults as well. The only recommendation I would have is to try choosing something you are interested in. Make sure that the time you spend on the side hustle doesn’t only make you money but also helps you grow. At this stage in your life, growth is more important than money. Think long-term and make your choices bearing that in mind.