Explain me both the projects ( and a few question on it.. What if I replace this component? How do I make it secure? Basically all ques related to Electronics)

Explain me both the projects ( and a few question on it.. What if I re

1.	Explain me both the projects ( and a few question on it.. What if I replace this component? How do I make it secure? Basically all ques related to Electronics)
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