Want to set $error variable in laravel so that i will display errors in blade - development

Want to set $error variable in laravel so that i will display errors in blade

as i can see in my blade like

@if ($errors->has('email'))
       <span class="invalid-feedback">
         <strong></strong>
      </span>
@endif

i want to set errors so that $error variable will contain error message i know in this case its getting error from default
suppose want to show custom error message to the $error variable how to do that and i have not passed that variable to the blade still it has access can u please tell me short working of that sorry but i am new to laravel

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