The document outlines 7 common mistakes, or "sins", that are made during the recruitment process. These include failing to consider millennial preferences when designing application and interview processes, copying recruitment strategies from other large companies without tailoring them, not utilizing recruitment agencies effectively, having an irrelevant referral bonus scheme, asking candidates irrelevant interview questions, not providing feedback to candidates during interviews, and not soliciting feedback from rejected candidates. The author advocates thinking like millennials, having unique strategies, valuing agency partnerships, incentivizing referrals for hard to fill roles, asking relevant questions, giving interview feedback, and learning from rejected applicants and rejections.