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Most humans do the easy part first. It's the most fun. Lots of people can play a guitar. Only a tiny fraction market enough to make any money.
If you want success (in anything) learn (and do) the hard part first. Every product idea starts with 3 basic questions;
A) who is this for?
B) how do I reach them. Prove it by getting 10 names, email addresses, and nominal deposits.
C) can my target market afford this? Poor people need private jet transport, but that market cannot afford that product.
Writing the code is the last thing you do, not the first.
Assuming of course your goal is to make money. I make ceramics for fun, not to sell. I get the joy of making and using my own pots. It's a hobby, not my day job. I'm not interested in marketing or selling them. And that's perfectly OK.