The shape of what DevOps would come to mean in the following years was further crystalized in large part by the hugely influential DevOps Handbook and Site Reliebility Engineering books. Adam, a veteran DevOps practitioner, has even called for a second wave DevOps which goes further than trivially improving tools and invites us to think outside of the box, challenge the established rules, and see what’s on the other side. Sure, spending the weekend installing a beefier switch in your home lab or rendering new mini figurines on your 3D printer doesn't directly show DevOps skills, but this background knowledge can indicate potential success in DevOps more than certificates can.