You can use Shopify to make money with no initial investment by leveraging its free trial period. First, sign up for a 14-day free trial and set up your store. Choose a dropshipping model so you don't need to invest in inventory upfront. You can partner with suppliers who ship products directly to customers. Use free marketing strategies like social media and content creation to attract traffic to your store. Focus on platforms like Instagram, Facebook, or Pinterest to promote your products. Consistently engage with your audience and drive traffic through organic methods to generate sales without spending money.