Selling Gaming PC Question

Duz7

Reputable
Jun 1, 2015
50
0
4,630
So I am selling the PC i built myself and want no trace of any of my information on it for the buyer to see. What can I do to make sure of this? And also, is there anything i should save on to my flash drive to carry over on to my next build? I already told the buyer Windows is not included so that doesnt need to be factored in. Thanks!