CS Fundamentals & DSA
Almost entirely Layer 0. Nothing here decays, and it is the highest-return domain on the map for anyone with a long horizon.
Clusters
Section titled “Clusters”Data structures
The cost model — what each operation costs and why — transfers to every language, every database index and every framework’s internals.
Algorithms
Recurrence structure and the decomposition habit transfer permanently, and directly into query planning and distributed-systems reasoning.
Problem-solving patterns
Recognising which pattern a problem fits is the skill, and it transfers to production code far more than the interview framing suggests.
Complexity analysis
Permanent. The vocabulary every performance conversation runs on.
CS core subjects
Layer 0 and the deepest transfer on the map: processes, scheduling, B-trees and the WAL explain behaviour in every product in domains 5, 6, 9 and 10.
Practice platforms
Tools, not subjects. Do not teach; use.