「基本 (きほん)」 refers to the foundation, basis, or fundamental principles of something. It's the essential part that everything else is built upon, crucial for learning skills or understanding concepts. Mastering the 'kihon' is key before moving to advanced levels. For example: 日本語の基本をしっかり学びましょう。(Let's thoroughly learn the basics of Japanese.)

物事の最も大切な土台や基礎となる部分。中心となる事柄や、一番大事な原則を指します。