Start with Kutztown University of Pennsylvania. Their Small Business Development Center offers more than 90 free online business courses to self learners. Courses cover a wide range of business topics, including accounting, advertising, business planning, finance, management, marketing, sales, and small business tax. Click here to visit the school.
The U.S. Small Business Administration offers a free accounting course. he course provides an overview of fundamental accounting topics. Course materials are easy to understand and take approximately 30 minutes to review. You can access the free course materials by clicking on the course name below. When you have finished the course, you can request a certificate of completion from the Small Business Administration. You can find the course by clicking here.
MIT offers a free technology and communication course. The self-guided course includes video lectures, lecture notes, assignments, and exams with solutions. You can access the free course materials by clicking on the course name below. You can access this course by clicking here.
So you see, there are free and valid resources for business school online.