diff --git a/Students/Nishan/To do list.html b/Students/Nishan/To do list.html
new file mode 100644
index 0000000..afef9e3
--- /dev/null
+++ b/Students/Nishan/To do list.html	
@@ -0,0 +1,156 @@
+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>To-Do List</title>
+
+<style>
+body {
+  font-family: Arial, sans-serif;
+  background: #1e1e2f;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
+  margin: 0;
+}
+
+.container {
+  background: white;
+  padding: 20px;
+  width: 350px;
+  border-radius: 10px;
+}
+
+h2 {
+  text-align: center;
+}
+
+.input-area {
+  display: flex;
+  gap: 10px;
+}
+
+input {
+  flex: 1;
+  padding: 8px;
+}
+
+button {
+  padding: 8px 12px;
+  cursor: pointer;
+  border: none;
+  background: #4CAF50;
+  color: white;
+  border-radius: 5px;
+}
+
+ul {
+  list-style: none;
+  padding: 0;
+  margin-top: 15px;
+}
+
+li {
+  background: #f4f4f4;
+  padding: 8px;
+  margin-bottom: 8px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  border-radius: 5px;
+}
+
+li.completed {
+  text-decoration: line-through;
+  color: gray;
+}
+
+.delete {
+  background: red;
+  color: white;
+  border: none;
+  padding: 5px 8px;
+  cursor: pointer;
+  border-radius: 5px;
+}
+</style>
+</head>
+
+<body>
+
+<div class="container">
+  <h2>To-Do List</h2>
+
+  <div class="input-area">
+    <input type="text" id="taskInput" placeholder="Enter task...">
+    <button onclick="addTask()">Add</button>
+  </div>
+
+  <ul id="taskList"></ul>
+</div>
+
+<script>
+let tasks = JSON.parse(localStorage.getItem("tasks")) || [];
+
+function saveTasks() {
+  localStorage.setItem("tasks", JSON.stringify(tasks));
+}
+
+function renderTasks() {
+  const list = document.getElementById("taskList");
+  list.innerHTML = "";
+
+  tasks.forEach((task, index) => {
+    const li = document.createElement("li");
+    li.textContent = task.text;
+
+    if (task.completed) {
+      li.classList.add("completed");
+    }
+
+    // toggle complete
+    li.addEventListener("click", () => {
+      tasks[index].completed = !tasks[index].completed;
+      saveTasks();
+      renderTasks();
+    });
+
+    // delete button
+    const btn = document.createElement("button");
+    btn.textContent = "X";
+    btn.classList.add("delete");
+
+    btn.addEventListener("click", (e) => {
+      e.stopPropagation();
+      tasks.splice(index, 1);
+      saveTasks();
+      renderTasks();
+    });
+
+    li.appendChild(btn);
+    list.appendChild(li);
+  });
+}
+
+function addTask() {
+  const input = document.getElementById("taskInput");
+  const text = input.value.trim();
+
+  if (text === "") return;
+
+  tasks.push({ text, completed: false });
+  input.value = "";
+  saveTasks();
+  renderTasks();
+}
+
+// initial load
+renderTasks();
+</script>
+
+</body>
+</html>
+```
diff --git a/Students/Nishan/python/calculator.py b/Students/Nishan/python/calculator.py
new file mode 100644
index 0000000..a736a56
--- /dev/null
+++ b/Students/Nishan/python/calculator.py
@@ -0,0 +1,35 @@
+def add(a, b):
+    return a + b
+
+def subtract(a, b):
+    return a - b
+
+def multiply(a, b):
+    return a * b
+
+def divide(a, b):
+    if b == 0:
+        return "Cannot divide by zero"
+    return a / b
+
+print("Select operation:")
+print("1. Add")
+print("2. Subtract")
+print("3. Multiply")
+print("4. Divide")
+
+choice = input("Enter choice (1/2/3/4): ")
+
+num1 = float(input("Enter first number: "))
+num2 = float(input("Enter second number: "))
+
+if choice == '1':
+    print("Result:", add(num1, num2))
+elif choice == '2':
+    print("Result:", subtract(num1, num2))
+elif choice == '3':
+    print("Result:", multiply(num1, num2))
+elif choice == '4':
+    print("Result:", divide(num1, num2))
+else:
+    print("Invalid input")
\ No newline at end of file
diff --git a/Students/Nishan/python/first class.py b/Students/Nishan/python/first class.py
new file mode 100644
index 0000000..26b6aa3
--- /dev/null
+++ b/Students/Nishan/python/first class.py	
@@ -0,0 +1 @@
+print ("hello world")
\ No newline at end of file
diff --git a/Students/Nishan/slider.html b/Students/Nishan/slider.html
new file mode 100644
index 0000000..3e88409
--- /dev/null
+++ b/Students/Nishan/slider.html
@@ -0,0 +1,108 @@
+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Image Slider</title>
+
+<style>
+body {
+  margin: 0;
+  font-family: Arial;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
+  background: #222;
+}
+
+.slider {
+  position: relative;
+  width: 800px;
+  overflow: hidden;
+}
+
+.slides {
+  display: flex;
+  transition: transform 0.5s ease-in-out;
+}
+
+.slides img {
+  width: 800px;
+  height: 400px;
+  object-fit: cover;
+}
+
+/* Buttons */
+button {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+  font-size: 30px;
+  background: rgba(0,0,0,0.5);
+  color: white;
+  border: none;
+  cursor: pointer;
+  padding: 10px;
+}
+
+.prev {
+  left: 10px;
+}
+
+.next {
+  right: 10px;
+}
+</style>
+</head>
+
+<body>
+
+<div class="slider">
+  <div class="slides">
+    <img src="https://picsum.photos/id/1015/800/400">
+    <img src="https://picsum.photos/id/1016/800/400">
+    <img src="https://picsum.photos/id/1018/800/400">
+  </div>
+
+  <button class="prev">&#10094;</button>
+  <button class="next">&#10095;</button>
+</div>
+
+<script>
+const slides = document.querySelector('.slides');
+const images = document.querySelectorAll('.slides img');
+
+let index = 0;
+const total = images.length;
+
+// Next
+document.querySelector('.next').addEventListener('click', () => {
+  index++;
+  if (index >= total) index = 0;
+  updateSlide();
+});
+
+// Prev
+document.querySelector('.prev').addEventListener('click', () => {
+  index--;
+  if (index < 0) index = total - 1;
+  updateSlide();
+});
+
+// Auto slide
+setInterval(() => {
+  index++;
+  if (index >= total) index = 0;
+  updateSlide();
+}, 3000);
+
+function updateSlide() {
+  slides.style.transform = `translateX(-${index * 800}px)`;
+}
+</script>
+
+</body>
+</html>
+```
diff --git a/getStarted/jsAdvance/simplecart.html b/getStarted/jsAdvance/simplecart.html
index b5e5f53..26951c4 100644
--- a/getStarted/jsAdvance/simplecart.html
+++ b/getStarted/jsAdvance/simplecart.html
@@ -163,7 +163,6 @@
     flex-shrink: 0;
     margin-top: 4px;
   }
-  .section-title-group {}
   .section-num {
     font-family: 'IBM Plex Mono', monospace;
     font-size: 11px;
