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Besides online courses and eBooks, here are other digital product ideas:
Premium newsletters - This digital product can be profitable if you can offer exclusive content that people are willing to pay regularly for. A good example is Jessie on a Journey’s VIP Opportunities List, a newsletter for travel bloggers looking to find paid gigs.
You can also consider types of photography within a framework of more broad genres. Arendsee titles these genres as:

3. Paid online surveys

2. Social Media