To advertise your business online for free, there are several strategies you can utilize. First, utilize social media platforms such as Facebook, Twitter, Instagram, and LinkedIn to promote your business. You can post regular updates, engage with customers, and use these platforms to direct traffic to your website. Creating high-quality, valuable content on a blog or website is another effective method. This could be in the form of articles, tutorials, or informative videos. SEO (Search Engine Optimization) is also crucial as it helps to increase the visibility of your website in search engines. Furthermore, listing your business on online directories, Google My Business, and review sites enhances your online presence. Also, sending newsletters through email marketing to an audience that has opted into your mailing list can also be beneficial. Participating in online discussions and forums like Quora or Reddit related to your business area can also help in increasing brand awareness. These strategies require effort and time but can beneficially influence your online presence and customer engagement, without incurring any costs.