The most basic and essential stage or content
When to use
beginner learning, basic knowledge explanation, introducing fundamental concepts
The nuance
Refers to the foundational knowledge or skills that must be learned first in study or work.
기본 (gi-bon, gibon) · 응용 (eung-yong, eungyong) · 심화 (sim-hwa, simhwa)
기본 refers to the fundamental level, 응용 to applying the basics, and 심화 to deepening and specializing knowledge.

One lane per word — no nested boxes, just the gist.
The most basic and essential stage or content
When to use
beginner learning, basic knowledge explanation, introducing fundamental concepts
The nuance
Refers to the foundational knowledge or skills that must be learned first in study or work.
The stage of applying basic knowledge to solve problems or real-life situations
When to use
problem solving, practical application, using basic knowledge
The nuance
Means using the basics as a foundation to adapt and apply in practical contexts.
The stage of learning or researching at a deeper, more specialized level beyond basics and application
When to use
specialized research, advanced learning, in-depth analysis
The nuance
Involves handling more complex or specialized content requiring in-depth understanding.
기본부터 차근차근 배우는 게 중요해.
gi-bon-bu-teo cha-geun-cha-geun bae-u-neun ge jung-yo-hae., gi bon bu teo cha geun cha geun bae u neun ge jung yo hae.
기본 fits perfectly for the initial foundational learning stage.
응용을 먼저 배우고 나서 기본을 공부해야 해.
eung-yong-eul meon-jeo bae-u-go na-seo gi-bon-eul gong-bu-hae-ya hae., eung yong eul meon jeo bae u go na seo gi bon eul gong bu hae ya hae.
응용 requires basic knowledge first, so 기본 must be learned before 응용.
심화 과정에서는 더 복잡한 문제를 다룹니다.
sim-hwa gwa-jeong-e-seo-neun deo bok-jap-han mun-je-reul da-rup-ni-da., sim hwa gwa jeong e seo neun deo bok jap han mun je reul da rup ni da.
심화 is suitable for advanced learning stages handling complex problems.
기본 과정에서 전문 연구를 진행한다.
gi-bon gwa-jeong-e-seo jeon-mun yeon-gu-reul jin-haeng-han-da., gi bon gwa jeong e seo jeon mun yeon gu reul jin haeng han da.
Basic stage (기본) is not for specialized research, which belongs to 심화.
응용 문제를 풀면서 실생활에 적용하는 연습을 한다.
eung-yong mun-je-reul pul-myeon-seo sil-saeng-hwal-e jeok-yong-ha-neun yeon-seup-eul han-da., eung yong mun je reul pul myeon seo sil saeng hwal e jeok yong ha neun yeon seup eul han da.
응용 involves practicing real-life application of basic knowledge.
심화는 초보자를 위한 단계이다.
sim-hwa-neun cho-bo-ja-reul wi-han dan-gye-i-da., sim hwa neun cho bo ja reul wi han dan gye i da.
심화 is for advanced learners, not beginners.
응용 단계에서만 기초적인 내용을 다룬다.
eung-yong dan-gye-e-seo-man gi-cho-jeok-in nae-yong-eul da-run-da., eung yong dan gye e seo man gi cho jeok in nae yong eul da run da.
Basic content is covered in 기본, not 응용 which focuses on application.
Which stage fits 'solving real-life problems' best?
Which stage corresponds to 'specialized research'?
Which word is suitable for explaining initial basic content?