If it's someone you know and trust, then I think a co-instructor setup is the right way to do this. You'll have to agree on a revenue split. If your friend is the primary instructor who created the course, then they will need to click on the little gear icon in the course's instructor dashboard and add you as a co-instructor with the split you agreed to. As you are both contributing materially to the course, there shouldn't be any issue with regards to policy. The policy's here if you want to be sure: https://support.udemy.com/hc/en-us/articles/229605728-Co-instructor-Relationships-Rules-and-Guidelines Just be aware that whoever the primary instructor is on the course has the power to change the revenue split at any time without your approval. You will be notified if it changes, but you have to trust the person. An alternative arrangement would be to charge your friend a fixed fee for your services. You'd still want to appear as a co-instructor since you are the face/voice of the course, but if payment were happening outside of Udemy you'd just have a 0% revenue cut. This would reduce your risk if the course doesn't sell well, but you'd lose out if it were successful.
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