How to redirect back to form with input in Laravel

In your HTML you have to use value = {{ old('') }}. Without using it, you can't get the value back because what session will store in their cache.
Like for a name validation, this will be-

<input type="text" name="name" value="{{ old('name') }}" />

Now, you can get the value after submitting it if there is error with redirect.

return redirect()->back()->withInput();

for back only:

return back()->withInput();