Don’t forget about the accessories

It’s easy to get distracted by the excitement of finishing a build, but you won’t see the fruit of your labor until you’ve connected your computer to the proper accessories. Pressing that power button won’t do much unless your PC is linked to a monitor.
And you won’t be able to do much with all that power you’ve just harnessed without a keyboard and mouse. Throw in a good pair of headphones, a USB mic, an external webcam, and whatever else you might need while you’re at it.