diff --git a/keyword/chatper02/keyword.md b/keyword/chapter02/keyword.md
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rename from keyword/chatper02/keyword.md
rename to keyword/chapter02/keyword.md
diff --git a/keyword/chapter03/keyword.md b/keyword/chapter03/keyword.md
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+## REST
+### REST(Representational State Transfer)란?
+자원을 이름으로 구분하여 해당 자원의 상태를 주고받는 모든것을 의미
+
+1. HTTP URI(Uniform Resource Identifier) 를 통해 자원(Resource)를 명시하고
+2. HTTP Method(POST, GET, PUT, PATCH, DELETE 등)을 통해
+3. 해당 자원(URI)에 대한 CRUD Operation을 적용하는 것을 의미한다.
+
+### CRUD Operation
+소프트웨어가 가지는 기본적인 데이터 처리기능인 Create, Read, Update, Delete를 묶어서 부르는 것이며 아래의 HTTP Method는 다음과 같이 CRUD에 해당한다.
+- Create : POST
+- Read : GET
+- Update : PUT, PATCH
+- Delete : DELETE
+
+### REST의 특징
+1. Server-Client(서버-클라이언트 구조)
+    - 자원을 가진 쪽이 Server, 자원을 요청하는 쪽이 Client가 된다
+
+2. Stateless(무상태)
+    - HTTP 프로토콜이 Stateless Protocol 이므로 REST도 Stateless를 갖는다.
+    - Client의 Context를 서버에 저장하지 않는다.
+        - 세션, 쿠키 같은 context정보를 신경쓰지 않아도 된다
+    - Server는 Client의 각 요청을 완전 별개의 것으로 인식하고 처리한다.
+        - Client가 이전에 어떤 요청을 했다고 해서 그 요청과 어떠한 연관성도 가지지 않는다.
+        - Server의 처리방식에 일관성을 부여하고 부담이 줄어드며, 서비스의 자유도가 높아진다.
+
+3. Cacheable(캐시 처리 가능)
+    - HTTP 프로토콜을 그대로 사용하기 때문에 HTTP의 가장 강력한 특징 중 하나인 캐싱기능을 적용할 수 있다.
+    - Last-Modified 태그나 E-Tag를 이용해 캐싱구현이 가능하다
+    - 대량의 요청을 효율적으로 처리하기위해 캐시가 필요된다.
+    - 캐시 사용을 통해 응답시간이 빨라지고 REST Server 트랜잭션이 발생하지 않아 응답시간, 성능, 서버의 자원이용률을 향상 시킨다.
+    - 캐시 메모리 처럼 반복되는 요청에 대한 데이터는 임시로 저장하여 서버까지 가지않도록 하는 것이다.
+
+4. Layered System(계층화)
+    - Client는 REST API Server만 호출 한다
+    - REST Server는 여러 계층으로 구성될 수 있다.
+    - Proxy, gateway 같은 네트워크 기반의 중간 매체를 사용할 수 있다.
+
+5. Uniformed Interface(인터페이스 일관성)
+    - URI로 지정한 Resource에 대한 조작을 통일되고 한정적인 인터페이스로만 수행한다.
+---
+
+## REST API
+### API란?
+프로그램간의 데이터를 주고받을 수 있도록, 상호작용이 가능하도록 하는 것
+- 예시 : 어떤 프로그램에서 지도 정보를 사용하기위해 카카오맵의 API를 사용한다
+
+### REST API란?
+REST 기반으로 서비스 API를 구현한 것
+
+### REST API의 특징
+- HTTP표준을 기반으로 구현하기 때문에, HTTP를 지원하는 프로그래밍 언어(자바, C#, 웹 등)로 서버-클라이언트를 구현할 수 있다.
+
+### REST API 설계 기본 규칙
+- 참고 리소스 원형
+    - 도큐먼트 : 객체 인스턴스나 DB 레코드와 비슷한 개념, 컬렉션에 있는 구체적인 멤버를 지칭함
+    - 컬렉션 : 서버에서 관리하는 directory resource
+    - 스토어 : 클라이언트에서 관리하는 리소스 저장소, 클라이언트에 종속
+
+1. URI는 정보의 자원을 표현해야 한다.
+    - resource는 동사보다는 명사, 대문자 보다는 소문자 사용
+    - resource의 도큐먼트 이름으로는 단수명사를 사용해야 한다.
+        - GET items/1
+    - resource의 컬렉션 이름으로는 복수명사를 사용해야 한다.
+        - GET items
+    - resource의 스토어 이름으로는 복수명사를 사용해야 한다.
+
+2. 자원에 대한 행위는 HTTP Method로 표현한다.
+    - URI에 HTTP method가 들어가선 안된다.
+    - URI에 행위에 대한 동사표현이 들어가선 안된다.
+    - 경로부분중 변하는 부분은 유일한(unique) 값으로 대체한다(Path variable)
+
+
+### REST API 설계 규칙
+1. 슬래시 구분자(/)는 계층 관계를 나타내는데 사용한다.
+2. URI 마지막 문자로 슬래시(/)를 포함하지 않는다.
+    - GET http://umc.com/users/missions/ (x)
+3. 하이픈(-)은 URI 가독성을 높이는데 사용한다.
+4. 언더스코어(_)는 URI에 사용하지 않는다.
+5. URI 경로에는 소문자를 사용한다.(대소문자가 구별이 되므로)
+6. 파일확장자는 URI에 포함하지 않는다.
+    - REST API에서 메시지 바디 내용을 포맷을 나타내기 위한 파일 확장자를 URI안에 포함시키지 않는다.
+    - Accept header를 사용한다.
+7. 리소스 간에는 연관 관계가 있는 경우
+    - /리소스명/리소스ID/관계가 있는 다른 리소스명
+    - ex) GET /users/{userid}/devices 
+
+
+---
+## RESTful API
+### RESTful 이란?
+- REST 원리를 따르는 시스템을 RESTful 하다 라고 지칭한다
+
+- RESTful한 API를 구현하는 근본적인 목적이 성능 향상에 있는 것이 아니라 일관적인 컨벤션을 통한 API의 이해도 및 호환성을 높이는 것이 주 동기이니, 성능이 중요한 상황에서는 굳이 RESTful한 API를 구현할 필요는 없다.
+    
+
+
diff --git a/mission/chapter03/Hello_world.png b/mission/chapter03/Hello_world.png
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diff --git a/mission/chapter03/mission.md b/mission/chapter03/mission.md
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+# 미션 API 설계
+
+### 홈 화면
+1.  홈 화면 보여주기
+       - API Endpoint :
+        ```
+        GET http://umc.com/home
+        ```
+       -  Request Header :
+        ```
+        Bearer Token
+        ```
+2. 미션 도전
+      - API Endpoint :
+       ```
+       POST http://umc.com/missions/{mission-id} 
+       ```
+      - Path variable : 
+       ```
+       mission-id
+       ```
+      - Request Header :
+       ```
+       Bearer Token
+       ```
+
+---
+
+
+### 마이페이지 리뷰 작성
+1. 리뷰 작성하기
+      - API Endpoint :
+       ```
+       POST http://umc.com/users/reviews 
+       ```
+      - Request body :
+         ```
+         {
+           "score" : ,
+           "content" : ,
+           "images" : [
+                        { 
+                          "URL" : ,
+                        }, ...
+                      ]
+         }
+         ```
+      - Request Header :
+       ```
+       Bearer Token,
+       content-type : Application/json
+       ```
+2. 내가 작성한 리뷰
+      - API Endpoint :
+       ```
+       GET http://umc.com/users/reviews 
+       ```
+      - Request Header :
+       ```
+       Bearer Token
+       ```
+
+---
+
+### 미션 목록 조회
+1. 진행 중인 미션 조회
+      - API Endpoint :
+       ```
+       GET http://umc.com/users/missions
+       ```
+      - Query string :
+       ```
+       status=1
+       ```
+      - Request Header :
+       ```
+       Bearer Token
+       ```
+2. 완료된 미션 조회
+      - API Endpoint :
+       ```
+       GET http://umc.com/users/missions
+       ```
+      - Query string :
+       ```
+       status=2
+       ```
+      - Request Header :
+       ```
+       Bearer Token
+       ```
+
+---
+### 미션 성공 누르기
+1. 미션 성공
+      - API Endpoint :
+       ```
+       PATCH http://umc.com/users/missions/{mission-id}
+       ```
+      - Request body :
+        ```
+        {
+           "status" : "2"
+        }
+        ```
+      - Path variable :
+       ```
+       mission-id
+       ```
+      - Request Header :
+       ```
+       Bearer Token
+       ```
+---
+### 회원가입
+1. 회원가입
+      - API Endpoint :
+       ```
+       POST http://umc.com/users
+       ```
+      - Request body :
+         ```
+         {
+           "name" : ,
+           "gender" : ,
+           "birth" : ,
+           "address" : ,
+           "food_categories" : [
+               { 
+                 "food_category_id" : ,
+               }, ...
+           ]
+         }
+         ```
+      - Request Header :
+       ```
+       content-type : Application/json
+       ```
+
diff --git a/mission/chapter03/nodemon.png b/mission/chapter03/nodemon.png
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diff --git a/mission/nodejs_project/.gitignore b/mission/nodejs_project/.gitignore
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+++ b/mission/nodejs_project/.gitignore
@@ -0,0 +1 @@
+node_modules/
\ No newline at end of file
diff --git a/mission/nodejs_project/.vscode/settings.json b/mission/nodejs_project/.vscode/settings.json
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index 0000000..baad46d
--- /dev/null
+++ b/mission/nodejs_project/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+  "javascript.preferences.importModuleSpecifierEnding": "js"
+}
\ No newline at end of file
diff --git a/mission/nodejs_project/package-lock.json b/mission/nodejs_project/package-lock.json
new file mode 100644
index 0000000..8ffb3bb
--- /dev/null
+++ b/mission/nodejs_project/package-lock.json
@@ -0,0 +1,1174 @@
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diff --git a/mission/nodejs_project/package.json b/mission/nodejs_project/package.json
new file mode 100644
index 0000000..d7551ae
--- /dev/null
+++ b/mission/nodejs_project/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "nodejs_project",
+  "type": "module",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node src/index.js",
+    "dev" : "nodemon --exec node src/index.js"
+  },
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "express": "^5.0.0"
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.7"
+  }
+}
diff --git a/mission/nodejs_project/src/index.js b/mission/nodejs_project/src/index.js
new file mode 100644
index 0000000..9db9151
--- /dev/null
+++ b/mission/nodejs_project/src/index.js
@@ -0,0 +1,13 @@
+//const express = require('express') // -> CommonJS
+import express from 'express'        // -> ES Module
+
+const app = express()
+const port = 3000
+
+app.get('/', (req, res) => {
+  res.send('Hello World!')
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening on port ${port}`)
+})
\ No newline at end of file