Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
Focus on each task or case at hand and you will be stuck dealing with them one by one. Instead if you build a machine by observing what you're doing and why, extrapolating the relevant principles from the cases at hand, and systemizing that process well you will accelerate your progress towards your goal. It typically takes about twice as long to build a machine as it does to resolve the task at hand, but it pays off many times over because the learning and efficiency compound into the future.