diff --git "a/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/.gitignore" "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/.gitignore"
new file mode 100644
index 0000000..c41cc9e
--- /dev/null
+++ "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/.gitignore"	
@@ -0,0 +1 @@
+/target
\ No newline at end of file
diff --git "a/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/Cargo.lock" "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/Cargo.lock"
new file mode 100644
index 0000000..141bb47
--- /dev/null
+++ "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/Cargo.lock"	
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "원준희"
+version = "0.1.0"
diff --git "a/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/Cargo.toml" "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/Cargo.toml"
new file mode 100644
index 0000000..a6b993b
--- /dev/null
+++ "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/Cargo.toml"	
@@ -0,0 +1,8 @@
+[package]
+name = "원준희"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git "a/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/src/main.rs" "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/src/main.rs"
new file mode 100644
index 0000000..6169347
--- /dev/null
+++ "b/Discussion/05 Using Structs to Structure Related Data/\354\233\220\354\244\200\355\235\254/src/main.rs"	
@@ -0,0 +1,167 @@
+// https://doc.rust-lang.org/stable/book/ch05-00-structs.html
+
+fn main() {
+    practice5_1();
+    // practice5_2();
+    // practice5_3();
+}
+
+fn practice5_1() {
+    // 구조체 정의
+    struct User {
+        // 구조체의 field 정의
+        username: String,
+        email: String,
+        sign_in_count: u64,
+        active: bool,
+    }
+
+    // 인스턴스 생성
+    let user1 = User {
+        active: true,
+        username: String::from("someusername123"),
+        email: String::from("someone@example.com"),
+        sign_in_count: 1,
+    };
+
+    // 인스턴스 필드 값 접근
+    println!("user1's email: {}\n\n", user1.email);
+
+    // 일반적으로 생성한 인스턴스는 필드 수정 불가
+    // user1.username = String::from("junhee"); // 에러 발생
+
+    // 특정 필드만 변경 가능 x => 모든 필드 변경 가능 or 변경 불가능
+
+    // mut 인스턴스 생성(필드 변경 가능)
+    let mut user2 = User {
+        email: String::from("someone@example.com"),
+        username: String::from("준희"),
+        active: true,
+        sign_in_count: 1,
+    };
+    println!("변경전 user2's username: {}", user2.username);
+    user2.username = String::from("원준희");
+    println!("변경후 user2's username: {}\n\n", user2.username);
+
+    // 함수로 인스턴스 생성
+    // 기본으로 설정할 필드 값이 있을 경우 편리
+    fn build_user(email: String, username: String) -> User {
+        // active와 sign_in_count는 기본값으로 설정
+        User {
+            active: true,
+            username: username,
+            email: email,
+            sign_in_count: 1,
+        }
+    }
+    let user3 = build_user(String::from("hello@naver.com"), String::from("커피"));
+    println!("user3's username: {}\n\n", user3.username);
+
+    // field init shorthand 로 위 함수 간단하게
+    fn build_user_by_field_init_shorthand(email: String, username: String) -> User {
+        User {
+            active: true,
+            username,
+            email,
+            sign_in_count: 1,
+        }
+    }
+    let user4 =
+        build_user_by_field_init_shorthand(String::from("hello@naver.com"), String::from("초코"));
+    println!("user4's username: {}\n\n", user4.username);
+
+    // 기존 인스턴스에서 Struct Update Syntax로 인스턴스 생성
+    // let user5 = user4; 는 ownership이 move되서 user4 접근 불가
+    // ..{인스턴스}는 맨 뒤에 있어야함
+    let user5 = User {
+        username: String::from("도넛"),
+        ..user4
+    };
+    println!("user5's username: {}\n\n", user5.username);
+
+    // 튜플 구조체
+    // 필드의 이름이 명시되지 않음
+    struct Color(i32, i32, i32);
+    let black = Color(0, 0, 0);
+    println!("black의 첫번째 속성: {}\n\n", black.0);
+
+    // 유사 유닛 구조체(unit-like structs)
+    // trait에 사용됨
+    struct Empty;
+}
+
+fn practice5_2() {
+    // derive 어노테이션으로 Debug trait 추가
+    #[derive(Debug)]
+    struct Coffee {
+        price: i32,
+        rating: f64,
+    }
+
+    let americano = Coffee {
+        price: 3000,
+        rating: 4.5,
+    };
+
+    // 인스턴스 출력 불가
+    // std::fmt::Display trait이 없어서
+    // println!("Americano is {}", americano);
+
+    // Debug 포맷으로 출력
+    println!("Americano is {:?}\n\n", americano);
+
+    // dbg! 메크로 사용
+    // dbg!는 ownership을 가져갔다 반환함
+    dbg!(&americano);
+    println!("\n\nAmericano is {}", americano.price);
+}
+
+fn practice5_3() {
+    struct Rectangle {
+        height: u32,
+        width: u32,
+    }
+
+    // impl: 구조체(struct), 열거형(enum), 트레이트(trait) 등의 타입에 대한 구현(implementation)을 정의하는 키워드
+    impl Rectangle {
+        // method 정의
+        // &self 파라미터는 해당 인스턴스를 의미
+        fn area(&self) -> u32 {
+            self.height * self.width
+        }
+    }
+
+    let rect1 = Rectangle {
+        height: 50,
+        width: 30,
+    };
+    println!("rect1's area: {}", rect1.area());
+    println!("rect1's width: {}\n\n", rect1.width);
+
+    // 파라미터에 &self 대신 그냥 self를 사용하면 ownership을 가져온다
+    impl Rectangle {
+        fn area_move_ownership(self) -> u32 {
+            self.height * self.width
+        }
+    }
+    println!(
+        "rect1's area (no return ownership): {}",
+        rect1.area_move_ownership()
+    );
+    // println!("rect1's width: {}", rect1.width);
+    print!("\n\n");
+
+    // associated function
+    // &self를 파라미터로 사용하지 않아서 method가 아니다
+    // ex) String::from()
+    impl Rectangle {
+        fn create_squre(width: u32) -> Rectangle {
+            Rectangle {
+                width,
+                height: width,
+            }
+        }
+    }
+    let square1 = Rectangle::create_squre(30);
+    println!("square1's area: {}", square1.area());
+}