Creating and selling digital products is much easier than ever. So it's very easy to create eBooks, online courses, templates or graphics using a tool like Canva or Word. Once you have made the digital profile, then upload them on platforms like Gumroad, Etsy, or even your website. Since they are digital, you only make them once and sell unlimited copies.
The most difficult part is marketing. So you can use social media, email lists or communities to promote your digital products. Have you ever thought of turning your knowledge into a digital product?