When joining LinkedIn in 2004, the author was initially confused about why people would publicly endorse and introduce him to others. However, he quickly gained a reputation as "the guy who knows everything about LinkedIn" and began running educational events to help others tap into its value. Despite improvements in LinkedIn's technology and features over the years, many users are still struggling to use it effectively. The author offers five things that work: personalizing invitations, reverse self-promoting by sharing others' success stories, tracking who listens to your posts, doubling down on connections across multiple platforms, and pruning one's network to focus on quality connections. By following these strategies, users can improve their LinkedIn experience and build meaningful relationships with others.