Answers for "Target class [WelcomeController] does not exist."

Target class [Controller] does not exist.

//accessing any function in the controller (this is web.php file)
use App\Http\Controllers\PostsController;

Route::get('/post', 'App\Http\Controllers\PostsController@index');

Target class [Controller] does not exist.

use App\Http\Controllers\UserController;

Route::get('/users', [UserController::class, 'index']);
// or
Route::get('/users', 'App\Http\Controllers\UserController@index');

Target class [Controller] does not exist.

Route::get('/users', [UserController::class, 'index']);

target class admin homecontroller does not exist laravel 8

Route::get('/home', 'App\Http\Controllers\HomeController@index')->name('home');