The "How-To-Gain-10x-Follower-On-Instagram.pdf" is a guide that outlines effective strategies for gaining 10x more followers on Instagram. The guide covers various topics such as knowing your audience, optimizing your profile, consistent posting, using relevant hashtags, engaging with your audience, running contests or giveaways, using Instagram stories, and promoting your Instagram account. The guide provides practical tips and advice to help users increase their Instagram following, whether for personal or business accounts.