diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/img/Understand-Typescript.jpg b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/img/Understand-Typescript.jpg
new file mode 100644
index 0000000..c3a5d16
Binary files /dev/null and b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/img/Understand-Typescript.jpg differ
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/01_interface-user.js b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/01_interface-user.js
new file mode 100644
index 0000000..563b18a
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/01_interface-user.js
@@ -0,0 +1,24 @@
+(() => {
+  // src/01_interface-user.ts
+  {
+    const userOne = {
+      id: 1,
+      name: "John",
+      lastName: "Wick"
+      // username: 'JW', // Object literal may only specify known properties, and 'username' does not exist in type 'User'.
+    };
+    userOne.id = 2;
+    userOne.lastName = "Doe";
+    console.log(userOne);
+    const userTwo = {
+      name: "Jane",
+      lastName: "Doe",
+      id: 3
+    };
+    Object.freeze(userTwo);
+    if (Object.hasOwn(userTwo, "name") && Object.hasOwn(userTwo, "id") && Object.hasOwn(userTwo, "lastName") && typeof userTwo.name === "string" && typeof userTwo.id === "number" && typeof userTwo.lastName === "string") {
+      console.log(userTwo);
+      console.log("Nerdy, without TS");
+    }
+  }
+})();
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/02_unions.js b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/02_unions.js
new file mode 100644
index 0000000..05b0269
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/02_unions.js
@@ -0,0 +1,19 @@
+(() => {
+  // src/02_unions.ts
+  {
+    let getResult = function() {
+      return Math.random() > 0.5 ? "Success" : 404;
+    }, getResult2 = function() {
+      return Math.random() > 0.5 ? "success" : "error";
+    };
+    let text = "Ich bin ein Text";
+    let value;
+    let value2;
+    value = 123;
+    value = "einszweidrei";
+    value2 = 123;
+    value2 = "einszweidrei";
+    console.log(getResult());
+    console.log(getResult2());
+  }
+})();
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/03_generics.js b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/03_generics.js
new file mode 100644
index 0000000..b6a4687
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/03_generics.js
@@ -0,0 +1,21 @@
+(() => {
+  // src/03_generics.ts
+  {
+    let identity = function(value) {
+      return value;
+    };
+    const identity2 = (value) => {
+      return value;
+    };
+    let stringResult = identity("Hello");
+    let numberResult = identity2(42);
+    console.log(stringResult, numberResult);
+    let names = ["Tick", "Trick", "Track"];
+    let names2 = ["Tick", "Trick", "Track"];
+    let numbers = [1, 2, 3];
+    let numbers2 = [1, 2, 3];
+    let namesWithAges = ["John", 48, "Alice", 23];
+    let namesWithAges2 = ["John", 48, "Alice", 23];
+    console.log(names, names2, numbers, numbers2, namesWithAges, namesWithAges2);
+  }
+})();
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/04_static-type-checking.js b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/04_static-type-checking.js
new file mode 100644
index 0000000..2aa6e6a
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/04_static-type-checking.js
@@ -0,0 +1,13 @@
+(() => {
+  // src/04_static-type-checking.ts
+  {
+    const data = [1, 2, 3, 4, 5, 6];
+    console.log(data.length);
+    const liEls = document.querySelectorAll("li");
+    liEls.forEach((el) => {
+      el.addEventListener("click", (e) => {
+        console.log("click");
+      });
+    });
+  }
+})();
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/05_type-definition-fn.js b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/05_type-definition-fn.js
new file mode 100644
index 0000000..f797875
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/assets/js/05_type-definition-fn.js
@@ -0,0 +1,8 @@
+(() => {
+  // src/05_type-definition-fn.ts
+  {
+    let calculateTotal = function(cart) {
+      return cart.getTotal();
+    };
+  }
+})();
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/index.html b/05_typescript/unterricht/tag28/01_ts-fundamentals/index.html
new file mode 100644
index 0000000..1b6c316
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/index.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html lang="de">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>TypeScript - Grundlagen</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet" />
+
+    <script src="assets/js/01_interface-user.js" defer></script>
+  </head>
+  <body>
+    <main>
+      <div class="container py-5">
+        <h1>TypeScript - Grundlagen</h1>
+        <p>
+          TypeScript ist eine von Microsoft entwickelte Skriptsprache, die auf den Vorschlägen zum ECMAScript-6-Standard
+          basiert und statische Typisierung zu JavaScript hinzufügt. Sprachkonstrukte von TypeScript, wie Klassen,
+          Vererbung, Module und anonyme Funktionen, wurden auch in ECMAScript 6 übernommen.
+        </p>
+        <img src="assets/img/Understand-Typescript.jpg" alt="TypeScript Kreisdiagramm" class="img-thumbnail" />
+      </div>
+    </main>
+  </body>
+</html>
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/package-lock.json b/05_typescript/unterricht/tag28/01_ts-fundamentals/package-lock.json
new file mode 100644
index 0000000..0d12be3
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/package-lock.json
@@ -0,0 +1,499 @@
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+        "@esbuild/netbsd-x64": "0.28.2",
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+        "@esbuild/openbsd-x64": "0.28.2",
+        "@esbuild/openharmony-arm64": "0.28.2",
+        "@esbuild/sunos-x64": "0.28.2",
+        "@esbuild/win32-arm64": "0.28.2",
+        "@esbuild/win32-ia32": "0.28.2",
+        "@esbuild/win32-x64": "0.28.2"
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+    }
+  }
+}
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/package.json b/05_typescript/unterricht/tag28/01_ts-fundamentals/package.json
new file mode 100644
index 0000000..18d394b
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "01_ts-fundamentals",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "ts": "npx esbuild \"src/*.ts\" --watch --bundle --outdir=\"assets/js\" --loader:.ts=ts"
+  },
+  "keywords": [],
+  "type": "module",
+  "devDependencies": {
+    "esbuild": "^0.28.2"
+  }
+}
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/src/01_interface-user.ts b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/01_interface-user.ts
new file mode 100644
index 0000000..b6cc1a7
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/01_interface-user.ts
@@ -0,0 +1,48 @@
+{
+  interface User {
+    name: string;
+    lastName: string;
+    id: number;
+  }
+
+  const userOne: User = {
+    id: 1,
+    name: 'John',
+    lastName: 'Wick',
+    // username: 'JW', // Object literal may only specify known properties, and 'username' does not exist in type 'User'.
+  };
+
+  userOne.id = 2;
+  userOne.lastName = 'Doe';
+
+  // userOne._id = 2; // Property '_id' does not exist on type 'User'.
+  // userOne.lastname = 'Wick' // Property 'lastname' does not exist on type 'User'. Did you mean 'lastName'?
+
+  console.log(userOne);
+
+  // ==== OHNE TypeScript
+
+  const userTwo = {
+    name: 'Jane',
+    lastName: 'Doe',
+    id: 3,
+  };
+
+  Object.freeze(userTwo);
+  // userTwo.username = 'JD'
+  // userTwo.lastname = 'JD' // Property 'lastname' does not exist on type '{ name: string; lastName: string; id: number; }'. Did you mean 'lastName'?
+
+  if (
+    Object.hasOwn(userTwo, 'name') &&
+    Object.hasOwn(userTwo, 'id') &&
+    Object.hasOwn(userTwo, 'lastName') &&
+    typeof userTwo.name === 'string' &&
+    typeof userTwo.id === 'number' &&
+    typeof userTwo.lastName === 'string'
+  ) {
+    console.log(userTwo);
+    console.log('Nerdy, without TS');
+  }
+
+  // userTwo.hasOwnProperty('name');
+}
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/src/02_unions.ts b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/02_unions.ts
new file mode 100644
index 0000000..b03e478
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/02_unions.ts
@@ -0,0 +1,26 @@
+// Unions - Ein Union Type ermöglicht es dir, eine Variable zu deklarieren, die mehr als einen Werttyp enthalten kann.
+{
+  // Type Annotation
+  let text: string = 'Ich bin ein Text';
+
+  type StringOrNumber = string | number; // unions
+
+  let value: string | number; // unions
+  let value2: StringOrNumber;
+
+  value = 123;
+  value = 'einszweidrei';
+
+  value2 = 123;
+  value2 = 'einszweidrei';
+
+  function getResult(): string | number {
+    return Math.random() > 0.5 ? 'Success' : 404;
+  }
+  function getResult2(): string {
+    return Math.random() > 0.5 ? 'success' : 'error';
+  }
+
+  console.log(getResult());
+  console.log(getResult2());
+}
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/src/03_generics.ts b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/03_generics.ts
new file mode 100644
index 0000000..9874b4f
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/03_generics.ts
@@ -0,0 +1,33 @@
+// Generics - Mit Hilfe von Generics kannst du wiederverwendbare Komponenten erstellen, die mit verschiedenen Datentypen arbeiten können und dabei die Typsicherheit wahren.
+
+{
+  // Generic
+  function identity<T>(value: T): T {
+    return value;
+  }
+
+  const identity2 = <T>(value: T): T => {
+    return value;
+  };
+
+  let stringResult = identity<string>('Hello');
+  let numberResult = identity2<number>(42);
+
+  console.log(stringResult, numberResult);
+
+  // Type Syntax
+
+  type StringArray = Array<string>; // string[];
+  type NumberArray = Array<number>; // number[]
+
+  let names: StringArray = ['Tick', 'Trick', 'Track'];
+  let names2: string[] = ['Tick', 'Trick', 'Track'];
+
+  let numbers: NumberArray = [1, 2, 3];
+  let numbers2: number[] = [1, 2, 3];
+
+  let namesWithAges: Array<string | number> = ['John', 48, 'Alice', 23];
+  let namesWithAges2: (string | number)[] = ['John', 48, 'Alice', 23];
+
+  console.log(names, names2, numbers, numbers2, namesWithAges, namesWithAges2);
+}
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/src/04_static-type-checking.ts b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/04_static-type-checking.ts
new file mode 100644
index 0000000..591aa19
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/04_static-type-checking.ts
@@ -0,0 +1,19 @@
+// Static Type Checking - Error linting während der Entwicklung
+
+{
+  const data = [1, 2, 3, 4, 5, 6];
+
+  console.log(data.length);
+
+  // data(); // This expression is not callable. Type 'number[]' has no call signatures.
+  // data.toLowerCase(); // Property 'toLowerCase' does not exist on type 'number[]'.
+  // data.addEventListener('click', () => {}) // Property 'addEventListener' does not exist on type 'number[]'.
+
+  const liEls = document.querySelectorAll('li');
+
+  liEls.forEach((el) => {
+    el.addEventListener('click', (e) => {
+      console.log('click');
+    });
+  });
+}
diff --git a/05_typescript/unterricht/tag28/01_ts-fundamentals/src/05_type-definition-fn.ts b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/05_type-definition-fn.ts
new file mode 100644
index 0000000..8f32c14
--- /dev/null
+++ b/05_typescript/unterricht/tag28/01_ts-fundamentals/src/05_type-definition-fn.ts
@@ -0,0 +1,10 @@
+// Type Definition für Funktionen
+{
+  interface ShoppingCart {
+    getTotal: () => number;
+  }
+
+  function calculateTotal(cart: ShoppingCart): number {
+    return cart.getTotal();
+  }
+}