[SoftTalker]

It also doesn't have to be very complicated. patio11 on here famously got his start selling a program that made bingo cards for teachers. And then doing automated appointment reminders for doctors. Neither of these ideas was complicated or original -- you just need to solve a problem that enough people have, and (critically) be able to market it.

[fsloth]

The marketing part is potentially quite challenging. As well as finding a niche market that is underserved.

patio11 is famous because what he did was really non-trivial even though he is such a humble person he discusses his work in very homely terms.

[SoftTalker]

Right, didn't intend to understate the achievement. Mostly emphasizing that the product idea does not have to be complicated or original. Success is overwhelmingly about it filling a need for the target market, execution, and professionalism.