diff --git a/.vscode/settings.json b/.vscode/settings.json
index 974a2b4..cbac569 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,3 +1,3 @@
 {
-  "deno.enable": false
+  "deno.enable": true
 }
diff --git a/handouts/01 - Einführung in TypeScript.pdf b/handouts/01 - Einführung in TypeScript.pdf
new file mode 100644
index 0000000..c58b734
Binary files /dev/null and b/handouts/01 - Einführung in TypeScript.pdf differ
diff --git a/handouts/02 - Syntax und Typsystem.pdf b/handouts/02 - Syntax und Typsystem.pdf
new file mode 100644
index 0000000..61c164f
Binary files /dev/null and b/handouts/02 - Syntax und Typsystem.pdf differ
diff --git a/src/02-syntax/kata.ts b/src/02-syntax/kata.ts
new file mode 100644
index 0000000..0b0dd48
--- /dev/null
+++ b/src/02-syntax/kata.ts
@@ -0,0 +1,36 @@
+type User = { name: string; age: number; isActive: boolean };
+
+export function createUserProfile(
+  name: string,
+  age: number,
+  isActive: boolean = true
+): User {
+  const user = { name, age, isActive };
+  return user;
+}
+
+export function getUserStatus(age: number): string {
+  if (age < 18) return 'Minderjährig';
+  if (age > 65) return 'Erwachsen';
+  return 'Senior';
+}
+
+export function calculateBirthYear(age: number): number {
+  const currentYear = new Date().getFullYear();
+  return currentYear - age;
+}
+
+export function logUserInfo(name: string, age: number | string): string {
+  return `Der Nutzer ${name} ist ${age} Jahre alt`;
+}
+
+console.log(createUserProfile('Alice', 30));
+
+console.log(getUserStatus(17));
+console.log(getUserStatus(40));
+console.log(getUserStatus(81));
+
+console.log(calculateBirthYear(30));
+
+console.log(logUserInfo('Alice', 30));
+console.log(logUserInfo('Bob', 'dreißig'));
diff --git a/src/02-syntax/typsystem.ts b/src/02-syntax/typsystem.ts
index f45ca11..01f2cff 100644
--- a/src/02-syntax/typsystem.ts
+++ b/src/02-syntax/typsystem.ts
@@ -39,3 +39,4 @@ if (typeof value === 'number') {
 } else {
   console.log('value ist keine number');
 }
+export default {}
diff --git a/src/02-syntax/variablen.ts b/src/02-syntax/variablen.ts
index 6c53d1b..43480a3 100644
--- a/src/02-syntax/variablen.ts
+++ b/src/02-syntax/variablen.ts
@@ -45,3 +45,4 @@ function testVar() {
 }
 
 console.log('test var: ', testVar());
+export default {};
diff --git a/src/03-klassen/classes.test.ts b/src/03-klassen/classes.test.ts
new file mode 100644
index 0000000..51e1874
--- /dev/null
+++ b/src/03-klassen/classes.test.ts
@@ -0,0 +1,32 @@
+import { assertEquals, assertThrows } from 'jsr:@std/assert';
+import { Admin, MathUtil, Person, User } from './classes.ts';
+
+Deno.test('User Klasse', () => {
+  const user = new User('Charly', 'charly@mail.com');
+  assertEquals(user.getInfo(), 'Charly (charly@mail.com)');
+});
+
+Deno.test('Admin Klasse', () => {
+  const admin = new Admin('Emil', 'emil@mail.com', 'admin');
+  assertEquals(admin.getInfo(), 'Emil (emil@mail.com), admin');
+  assertEquals(admin.role, 'admin');
+});
+
+Deno.test('MathUtil Klasse', () => {
+  const excptected = 78.53975;
+  const actual = MathUtil.circleArea(5);
+
+  assertEquals(actual, excptected);
+});
+
+Deno.test('Person Klasse', () => {
+  const person = new Person(30);
+  assertEquals(person.age, 30);
+
+  person.age = 40;
+  assertEquals(person.age, 40);
+
+  assertThrows(() => {
+    person.age = -1;
+  }, Error);
+});
diff --git a/src/03-klassen/classes.ts b/src/03-klassen/classes.ts
new file mode 100644
index 0000000..6458b56
--- /dev/null
+++ b/src/03-klassen/classes.ts
@@ -0,0 +1,105 @@
+export class User {
+  private name: string;
+
+  constructor(name: string, private email: string) {
+    this.name = name;
+    this.email = email;
+  }
+
+  getInfo() {
+    return `${this.name} (${this.email})`;
+  }
+}
+
+const alice = new User('Alice', 'alice@mail.com');
+
+console.log(alice.getInfo());
+
+export class Admin extends User {
+  constructor(name: string, email: string, public role: string) {
+    super(name, email);
+  }
+
+  override getInfo(): string {
+    return super.getInfo() + ', ' + this.role;
+  }
+}
+
+const bob = new Admin('Bob', 'bob@mail.com', 'admin');
+console.log(bob.getInfo());
+console.log(bob.role);
+
+class MyClass {
+  public publicProperty: string = 'Public';
+  private privateProperty: string = 'Private';
+  protected protectedProperty: string = 'Proctected';
+
+  getPrivatePropertyValue(): string {
+    return this.privateProperty;
+  }
+}
+
+class MySubClass extends MyClass {
+  public getProtectedPropertyValue(): string {
+    return this.protectedProperty;
+  }
+}
+
+const myclass = new MyClass();
+console.log(myclass.publicProperty);
+console.log(myclass.getPrivatePropertyValue());
+
+const mysubclass = new MySubClass();
+console.log(mysubclass.getProtectedPropertyValue());
+
+export class MathUtil {
+  static PI: number = 3.14159;
+  test = 'demo';
+
+  static circleArea(radius: number): number {
+    return this.PI * radius * radius;
+  }
+}
+
+const mathUtil = new MathUtil();
+mathUtil.test;
+
+export class Person {
+  private _age: number;
+  constructor(age: number) {
+    this._age = age;
+  }
+
+  get age(): number {
+    return this._age;
+  }
+
+  set age(value: number) {
+    if (value < 0) {
+      throw new Error('Alter kann nicht negativ sein!');
+    }
+
+    this._age = value;
+  }
+}
+
+const person = new Person(42);
+
+console.log(person.age);
+person.age = 43;
+console.log(person.age);
+
+export abstract class Animal {
+  constructor(public name: string) {}
+
+  abstract makeSound(): void;
+}
+
+class Dog extends Animal {
+  override makeSound(): void {
+    console.log('Wuff wuff');
+  }
+}
+
+const dog = new Dog('Bello');
+dog.makeSound();