This section is dedicated to building a strong foundation in core algorithmic theory, the essential building blocks behind effective problem-solving.
Rather than focusing solely on solutions, the goal here is to deeply understand how and why certain techniques work. You'll learn to break down problems, recognize patterns, and apply the right strategy at the right time.
Topics are organized into three levels. 
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Foundation : Fundamental concepts and patterns to get started.
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Intermediate : Practical tools and techniques used in most algorithmic problems.
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Advanced : High-performance strategies used in complex challenges and technical interviews.
Each topic includes key principles, time/space complexity, common use cases, and links to practice problems where applicable.