Get a partner who you can have a proper professional relationship with. They will keep you motivated and honest about what you can achieve. This not always possible with friends.
Try to make money as soon as you can (obviously). Having to chase investers and deliver unrealistic scope to keep them happy will burn you out.
Don't chase the mythical "exit". Try for a sustainable income for yourself and your colleagues. This is an enviable and realistic goal (one I haven't managed to achieve but would f-in love to)
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