Map of Content covering 101 foundational data engineering concepts across 11 categories: Storage/Warehousing, Open Table/File Formats (Parquet, Iceberg, Delta), Architectures (Data Mesh, Medallion, Modern Data Stack), Data Modeling (Vault, Anchor, ECM, Dimensional), Ingestion/CDC (ETL vs ELT, Kafka), Orchestration (Airflow, Dagster, dbt), Governance (Catalog, Lineage, Contracts), Semantic Layer, OLAP/BI, Performance (CAP, Materialized Views), and Career. Entry point to a larger 1,000+ note vault by Simon Späti. Pairs with companion 'Data Engineering Toolkit' covering 70+ tools and the dedp.online book.