First you have to go to routes folder of Laravel then web.php and in web.php you have to create routes to the page you want. Here i have created route for page youtube.
Now after creating route for youtube page you have to create that youtube page
So,in order to create youtube page go to resources and then views and then create new file named as youtube.blade.php and make service as you want.
Now you go to resource and the views and on welcome.blade.php you can add anchore tag as
<a href="youtube"> Got to Youtube page</a>
Now you can type on local browser as localhost/