Create an .htaccess file and add this code.

RewriteEngine on

# If a directory or a file exists, use it directly

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

# Otherwise forward it to index.php

RewriteRule . index.php

2. Now Modify common/config/main-local.php

'urlManager' => [
   'class' => 'yii\web\UrlManager',
   'showScriptName' => false,   
   'enablePrettyUrl' => true,
   'rules' => array(
      '<controller:\w+>/<id:\d+>' => '<controller>/view',
      '<controller:\w+>/<action:\w+>/<id:\d+>' => '<controller>/<action>',
      '<controller:\w+>/<action:\w+>' => '<controller>/<action>',
   ),
],
BY Best Interview Question ON 13 Jan 2019