It is very important to have a real knowledge of any business sector you are planning to work in. Such knowledge has to be practical, hands-on that can only be acquired by actually talking to people who work in these sectors and then working in the sector yourself maybe through an internship or a similar arrangement.
Having technology does not automatically produce solutions that will work. You will have to dig in, acquire domain-specific knowledge and intricacies that can help you really solve the problems.
You can rarely make impact in a business sector when you barely understand how it works.
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