I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:

• yewtu.be
• inv.nadeko.net
• yt.artemislena.eu
• piped.video

Same concept could apply to lots of things. Even something like theory. We should understand the basics, and then read that which is relevant or interesting to us. Having a backlog creates anxiety if you feel obligated to complete it. Keeping track of what you have done and how you felt about it (or even more detailed notes as should be done with theory) sounds like a really good way to make something more engaging and a better way to have sustainable motivation.

Definitely doesn’t apply to other things like work or household chores. You need to complete all the items on the to-do list for those, though items can usually be post-poned or shared with others in the event of time and resource constraints.