I have a few YouTube channels that I enjoy and look forward to their next uploads. I subscribe to those channels so that I'm notified when new videos are uploaded and whenever those channels host live streams. A few of the channels I'm subscribed to are SciShow Kids, Tom Richey, and Minute Earth. If you're a high school history teacher, I'd recommend subscribing to Tom Richey's channel and sharing it with your students. In the following video I demonstrate how to subscribe to a YouTube channel.
The first part of the video shows you how to search within a YouTube channel. This is a great way to search within a trusted source for additional content.