Even though there are a lot of methods to make money online and these methods might be technically free to use, but you will have to spend money to make money. You need money to build skills and knowledge. Even if you already have skills and knowledge, you might still need additional knowledge and skills. Even a simple thing like starting a blog or starting a youtube channel needs money. You will have to buy a domain and hosting to start your blog, you will have to invest in equipment and editing software to start youtube channel. Most methods that do not need money earn you pennies.