1. Know what system you want to make and whether the business developed by the company matches you.
2. Understand the business requirements of your own project, and look for companies with similar cases according to the requirements.
Another point is not to care too much about trifles. Things are always difficult to be perfect, especially in the early stage of the project, and imperfections must be tolerated. You need to do things step by step, and you must be able to accommodate people and things.