I'm new to Arduino, and I wanted to play around with different led lighting effects. I saw this Youtube video (How to control LED Strips with Arduino - Cosplay Tutorial - YouTube) and thought this would be simple, but alas, it's not. I have tried two different Arduinos, and both turn off when I put the pin in the 5v side. Is there something I'm doing wrong?
Those LED strips draw quite a bit of current which would be too much for an Arduino powered from USB alone. How did you power it? How many LED chips were you trying to power?
Please show your schematic with ALL wires and pin numbers. How your board powered?
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
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How many LEDs? For WS2812B, count on 20 mA per colour per LED. Full white will in that case be around 60 mA per LED.
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