how to show 404 page in laravel 5.2?

I want to show the 404 pages in laravel 5.2 projects. but how is possible and how to handle errors in laravel 5.2? please help me!

1. how to handle errors in laravel 5.2?
2. how to return 404 page?
3. if cannot find URL then return 404 page in laravel 5.2?

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