I'm doing this for him: new build beginner

Nov 20, 2018
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Hello. I'm totally new to PC gaming but this is not for me, it's for my teenage son. I think it would be good for him to build his own system. I'm willing to gather up components from multiple sources. I dont know what all he needs though. I've been doing my own research and just feel overwhelmed. I would lke to stay under $600 (if possible). He likes games like Fortnite and COD. Can you help me put together a shopping list? (Starting from scratch need everything but keyboard, mouse, and monitor).