I attended the Corelan Expert-level Stack class; it was my third training in exploit development, following the OSCP and GXPN courses. This one was very different—in a good way—because at first, you might think that you don’t have the skill level or aren’t smart enough to follow along. However, the training materials are very well structured, and I really enjoyed Peter’s teaching style, which was both studious and laid-back. From the first to the last day, the complexity increases, but you (almost) never feel it’s beyond reach. What I especially appreciated was that there were no gray areas. If specific steps were needed to complete an exercise, Peter explained both the ‘why’ and ‘how,’ so you never felt like you were missing key details needed to understand the material. Thank you Peter for the awesome training!