There's a webinar coming up tomorrow hosted by GrantSpace about shifting your events online during COVID-19 that might have some helpful information for you: https://grantspace.org/training/2020-05-20-shifting-your-events-online-during-covid-19/
For tracking engagement on these videos, there are definitely several options you can choose from. YouTube is a great place to start because you'll have access to analytics like Reach, Engagement, Audience, Traffic Sources, etc. all in one place. Then you can easily share that YouTube video on your social channels or embed it on your website so that all views are tracked back to your YouTube analytics page. If you have Google Analytics connected to your webpage, you can also gain more information about your visitors who engage with the video.
If you have a large and active Facebook following, you could also use Facebook Live but to me it's a matter of how much data do you want to track. You'll get general data points like Peak Live Viewers, Minutes Viewed, Average % Completion but they're mostly big picture numbers.
In my opinion, YouTube allows you to get more granular and even be able to see where in the world people are watching your videos. Then you can still use your website and social media accounts to help promote and share the lessons.
Best of luck!
#General