Answers for "Target class [AuthController] does not exist. in"

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 admin homecontroller does not exist laravel 8

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