How can I learn Number Theory for solving problems?

Hi!
I am new in this community. I’m currently a school student. I want to learn number theory for solving problems. How can I learn number theory for solving mathematical problems?

It would be nice if you answered.

Learn Modular Arithmatics

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What resources would you suggest for learning modular arithmetics ?

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https://drive.google.com/file/d/1nLD8dPg5GK1GPfCg6HnAqr6_LSqvGBgC/view?usp=drivesdk

Modern Olympiad Number theory book

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Thanks a lot…really.