core concepts
- fundamentalForming the base
- essenceFundamental nature of something
- heartCirculatory system's pump
- nucleusCentral controlling part
- centerMiddle of anything
foundation · principles · basics · pillars · framework · bedrock · keystones · building blocks · underpinnings · tenets · axioms · roots · scaffolding · spine · skeleton · DNA · seed · kernel
- elementary schoolclassroom, student, first grade teacher, reading skills, teacher
- beginningsbegin, beginning, start, first, opening
- tutorialstutorial, how-tos, quick start guide, tutorial video, step-by-step guide
centrality/importance
core conceptsside issues
Nonessential related matters
footnotes · minutiae · nonessentials · minor points · minor details
foundational vs. derived
core conceptselaborations
Expanded explanations with detail
extensions · corollaries · applications · add-ons · appendages
abstraction level
core conceptspractical applications
Real-world implementations of ideas
nuts and bolts · technicalities · fine print · granular details · raw data