Teachers can make money online by creating and selling their own online courses. This can be a great way for teachers to supplement their income and share their knowledge and expertise with a wider audience. To create an online course, teachers can use online course platforms like Thinkific or Teachable to host their course materials and manage enrollments and payments. Teachers can then promote their online course through social media, email marketing, and other online channels to reach potential students. By offering high-quality content and providing value to their students, teachers can build a successful online course business and make money from their expertise.