Everyone makes mistakes. But we can learn from them and learn from others too. Here are some mistakes either I, my colleagues or some I have mentored have made.
The field of dreams business plan
Having the "if you built it, they will come" attitude is setting yourself up for instant failure.
Limiting your research
Copy and paste
Being a carbon copy of another is the definition of a fake. If you see someone or something you think you would like to imitate, think instead about how you could take that as an example and make it better.