However it is much better from the early beginning to work out an idea which is commercially viable and fits directly to you - to your passions, motivations, values, skills, etc.
Here I recorded a short video with description of a simple and practical method: https://youtu.be/-PCzT66UH44
It allows you to compromise the commercial aspects with individual, personal needs and can facilitate your entrepreneurial thinking.
Let me know what you think about it.