return Redirect::back()->withErrors(['msg', 'The Message']);
and inside your view call this
@if($errors->any())
<h4>{{$errors->first()}}</h4>
@endifRoute::post('user/profile', function () {
// Update the user's profile...
return redirect('dashboard')->with('status', 'Profile updated!');
});@if (\Session::has('success'))
<div class="alert alert-success">
<ul>
<li>{!! \Session::get('success') !!}</li>
</ul>
</div>
@endif
return redirect()->back()->with('success', 'your message,here');
create validation errors
<!-- /resources/views/post/create.blade.php -->
<h1>Create Post</h1>
@if ($errors->any())
<div class="alert alert-danger">
<ul>
@foreach ($errors->all() as $error)
<li>{{ $error }}</li>
@endforeach
</ul>
</div>
@endif
<!-- Create Post Form -->
##error message:
<!-- /resources/views/post/create.blade.php -->
<label for="title">Post Title</label>
<input id="title" type="text" name="title" class="@error('title') is-invalid @enderror">
@error('title')
<div class="alert alert-danger">{{ $message }}</div>
@enderror