buck & boost switching regulators & converters (DC TO DC) how do they work?

In this video I want to share with you the working principle of DC to DC regulators & converters or as some people know it, DC to DC converter circuit. Since it is highly effective and cheap, it is very popular nowadays.So, I want to teach you its working principles in a simple way, and i hope this experience may be helpful to you as well.
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very good