Сделали useReducer для счетчика

src/App.jsx

@@ -1,10 +1,50 @@
-// удаляем все, оставляя лишь пустую функцию App ниже
+import { useState, useReducer } from 'react'
+
+function counterReducer(state, action) {
+    switch (action.type) {
+        case 'increment':
+            return state + 1
+        case 'decrement':
+            return state - 1
+        case 'reset':
+            return 0
+        case 'set_value':
+            return action.value
+        default:
+            return state
+    }
+}
+
+function Counter() {
+    const [count, dispatch] = useReducer(counterReducer,0);
+    
+    return (
+        <div>
+            <span>Счетчик: {count}</span>
+            <button onClick={()=> dispatch({type: 'increment'})}>+</button>
+            <button onClick={()=> dispatch({type: 'decrement'})}>-</button>
+            <button onClick={()=> dispatch({type: 'reset'})}>reset</button>
+            <button onClick={()=> dispatch({type: 'set_value', value: 5})}>set 5</button>
+        </div>
+    )
+}
 
 function App() {
+    const [tasks, setTasks] = useState([])
+    const [filter, setFilter] = useState('all')
+    const [sortBy,setSortBy] = useState('date')
+    
+    const addTask = newTask => {
+        setTasks([...tasks,newTask])
+    }
+    
+    
+    
 	return (
 		<>
 			{/* Добавьте тестовый контент для проверки */}
 			<h1>Hello, React!</h1>
+            <Counter />
 		</>
 	)
 }

src/App.module.scss

@@ -0,0 +1,15 @@
+.container {
+/*    display: flex;
+    flex-direction: column;
+    flex-wrap: nowrap;*/
+    height: 500px;
+    overflow: auto;
+    border: 1px solid black;
+}
+.item {
+    font-size: 16pt;
+    border: 1px dotted gray;
+    /*margin: 5px 10px;
+    padding: 10px;*/
+    border-radius: 5px;
+}