I wouldn't get an interview from Google even if I wanted to. I'm 29 and live in Africa. That said this guide was still helpful. A reminder of some of the skills I should hone for my next interview. I loved reading the comments here because they give so much perspective from all sorts of people. HN is extremely critical of everything and it can be sobering. I cannot obviously speak about the intentions or damage such guides have or can do but honestly, even if you know how to code, it doesn't hurt to prepare for an interview in a way a prospective company would want you to.