1. To monetize videos on YouTube, a channel must reach 1000 subscribers and 4000 hours of watch time within 12 months. This ensures quality for advertisers. 2. Once requirements are met, a creator can join the YouTube Partner Program and link their AdSense account. This involves accepting terms, creating an AdSense account if needed, and linking it to their channel. 3. YouTube then reviews the channel's content to check if it follows guidelines. If approved, creators get notified and can enable monetization settings for videos on their channel.