What YouTube feature should Mr. Garcia use to be notified when new content is uploaded to a relevant channel?

Mr. Garcia should use the Subscriptions feature on YouTube to receive notifications when new content is uploaded to a relevant channel. By subscribing to a channel, he will see updates and new videos from that channel appear in his subscription feed, which helps him stay informed about the channel's latest content. Additionally, he can set notifications to receive alerts directly, ensuring that he does not miss any new uploads.

The other features, such as Favorites, allow users to save videos they like but do not provide notifications about new content. Sharing pertains to distributing video links with others and does not relate to channel updates. Comments enable interaction on videos but do not serve as a method for tracking new uploads. Thus, Subscriptions is the most effective way for Mr. Garcia to keep up with new content from specific YouTube channels.