YouTube is a useful channel for hosting video; its algorithm can also help your videos to be found by relevant audiences. There is a social aspect of YouTube with users being able to leave comments, however the channel has a high number of trolls and comments require moderation.

Framework Metrics
Size of audience Audience - unique viewers
Engaged audience Watch time, Average view duration, Engagements (likes/dislikes, comments, shares)
Results Conversions, avg value

Other useful metrics

Metric Why?
Demographics YouTube's analytics provide information about your viewers' demographics, including age, gender, and location. This helps you understand your audience better and tailor your content accordingly.
Subscribers The number of subscribers represents your loyal audience. Monitor subscriber growth to gauge the appeal of your content and its ability to retain viewers. This is only relevant if you have a YouTube content strategy and are specifically aiming to build an audience on YouTube.
Video traffic and discovery Analyse which videos are driving traffic to other videos, both within your channel and across YouTube. This can help you identify content that has a strong cross-promotional effect.