Answers for "Illuminate\Contracts\Container\BindingResolutionException Target class [TeacherController] does not exist."

IlluminateContractsContainerBindingResolutionException target calss does not exist

Routing namespaces have been updated on Laravel 8.X

On your router, you should define:
use AppHttpControllersTestController;

And then, declare:
Route::get('test',[TestController::class, 'test']);

IlluminateContractsContainerBindingResolutionException Target class [SlugController] does not exist.

Route::get('/test/{slug}',  'AppHttpControllersSlugController@show' );