diff --git a/web/06/labor/06_loesungen/buecher/book.go b/web/06/labor/06_loesungen/buecher/book.go
new file mode 100644
index 0000000..f72036b
--- /dev/null
+++ b/web/06/labor/06_loesungen/buecher/book.go
@@ -0,0 +1,48 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type Book struct {
+	ID     int    `json:"id"`
+	Title  string `json:"title"`
+	Author string `json:"author"`
+	Read   bool   `json:"read"`
+}
+
+type Library struct {
+	Books []Book `json:"books"`
+}
+
+func (lib *Library) Add(title, author string) {
+	id := len(lib.Books) + 1
+	lib.Books = append(lib.Books, Book{ID: id, Title: title, Author: author, Read: false})
+}
+
+func (lib *Library) MarkRead(id int) {
+	for i := range lib.Books {
+		if lib.Books[i].ID == id {
+			lib.Books[i].Read = true
+		}
+	}
+}
+
+func (lib *Library) Save(filename string) error {
+	data, err := json.MarshalIndent(lib, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(filename, data, 0644)
+}
+
+func LoadLibrary(filename string) (*Library, error) {
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return &Library{}, nil
+	}
+	var lib Library
+	err = json.Unmarshal(data, &lib)
+	return &lib, err
+}
diff --git a/web/06/labor/06_loesungen/buecher/books.json b/web/06/labor/06_loesungen/buecher/books.json
new file mode 100644
index 0000000..882dda5
--- /dev/null
+++ b/web/06/labor/06_loesungen/buecher/books.json
@@ -0,0 +1,16 @@
+{
+  "books": [
+    {
+      "id": 1,
+      "title": "Der Steppenwolf",
+      "author": "Hermann Hesse",
+      "read": false
+    },
+    {
+      "id": 2,
+      "title": "Clean Code",
+      "author": "Robert C. Martin",
+      "read": true
+    }
+  ]
+}
\ No newline at end of file
diff --git a/web/06/labor/06_loesungen/buecher/main.go b/web/06/labor/06_loesungen/buecher/main.go
new file mode 100644
index 0000000..b4ad205
--- /dev/null
+++ b/web/06/labor/06_loesungen/buecher/main.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: add <title> <author> | list | read <id>")
+		return
+	}
+
+	lib, _ := LoadLibrary("books.json")
+
+	switch os.Args[1] {
+	case "add":
+		if len(os.Args) < 4 {
+			fmt.Println("Usage: add <title> <author>")
+			return
+		}
+		lib.Add(os.Args[2], os.Args[3])
+		lib.Save("books.json")
+		fmt.Println("Buch hinzugefügt.")
+
+	case "list":
+		for _, b := range lib.Books {
+			status := " "
+			if b.Read {
+				status = "✓"
+			}
+			fmt.Printf("[%s] %d: \"%s\" by %s\n", status, b.ID, b.Title, b.Author)
+		}
+
+	case "read":
+		if len(os.Args) < 3 {
+			fmt.Println("Geben Sie eine Buch-ID ein.")
+			return
+		}
+		id, err := strconv.Atoi(os.Args[2])
+		if err != nil {
+			fmt.Println("Ungültige ID-Eingabe.")
+			return
+		}
+		lib.MarkRead(id)
+		lib.Save("books.json")
+		fmt.Println("Buch als gelesen markiert.")
+	}
+}
diff --git a/web/06/labor/06_loesungen/buecher/workshop-api.json b/web/06/labor/06_loesungen/buecher/workshop-api.json
new file mode 100644
index 0000000..f616880
--- /dev/null
+++ b/web/06/labor/06_loesungen/buecher/workshop-api.json
@@ -0,0 +1,119 @@
+{
+	"openapi": "3.0.0",
+	"info": {
+		"title": "Workshop API",
+		"version": "1.0.0"
+	},
+	"servers": [
+		{
+			"url": "http://localhost:8081"
+		}
+	],
+	"paths": {
+		"/registrierung": {
+			"post": {
+				"summary": "Sends all information needed for registering at a workshop",
+				"requestBody": {
+					"required": false,
+					"content": {
+						"application/x-www-form-urlencoded": {
+							"schema": {
+								"$ref": "#/components/schemas/RegistrierungForm"
+							}
+						},
+						"application/json": {
+							"schema": {
+								"$ref": "#/components/schemas/RegistrierungForm"
+							}
+						}
+					}
+				},
+				"responses": {
+					"200": {
+						"description": "Success",
+						"content": {
+							"text/html": {
+								"schema": {
+									"type": "string"
+								}
+							}
+						}
+					},
+					"400": {
+						"description": "Bad Request",
+						"content": {
+							"text/plain": {
+								"schema": {
+									"type": "string",
+									"example": "Kein Formular gesendet"
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	},
+	"components": {
+		"schemas": {
+			"RegistrierungForm": {
+				"type": "object",
+				"required": [
+					"vorname",
+					"nachname",
+					"agb",
+					"format"
+				],
+				"properties": {
+					"vorname": {
+						"type": "string",
+						"example": "Zoya"
+					},
+					"nachname": {
+						"type": "string",
+						"example": "Akhtar"
+					},
+					"email": {
+						"type": "string",
+						"example": "z.akhtar@test.de"
+					},
+					"telefon": {
+						"type": "string",
+						"example": "Zoya"
+					},
+					"sessions": {
+						"type": "array",
+						"items": {
+							"type": "string",
+							"example": "vormittag"
+						},
+						"example": [
+							"vormittag",
+							"nachmittag"
+						]
+					},
+					"agb": {
+						"type": "string",
+						"enum": ["ja"],
+						"example": "ja"
+					},
+					"newsletter": {
+						"type": "string",
+						"enum": ["ja"],
+						"example": "ja"
+					},
+					"equipment": {
+						"type": "string",
+						"enum": ["ja"],
+						"example": "ja"
+					},
+					"format": {
+						"type": "string",
+						"enum": ["online","praesenz"],
+						"example": "online"
+					}
+				}
+			}
+		}
+	}
+}
\ No newline at end of file