There are several platforms that you can use to conduct online lessons and download courses, depending on your specific needs. One popular option is Teachable, which allows you to create and sell courses, manage students, and integrate with other tools. Another option is Udemy, which has a large user base and offers a marketplace for selling courses. You can also consider using webinar platform such as Coursera, Kwiga, edX, or Skillshare, which provide a range of features for course creation, management, and marketing. It’s important to research and compare the different platforms to find the one that best suits your business needs.