初歩 (しょほ) Basics, Rudiments, Elements, ABCs
基本 (きほん) Foundation, Basics
基本的 (きほんてき) Fundamental, Basic, Standard
基盤 (きばん) Base, Basis, Foundation
根本 (こんぽん、ねもと) Root, Source, Origin, Foundation
基礎 (きそ) Foundation, Fundamentals
礎 (いしずえ) Foundation, Cornerstone