I've been using YouTube videos. One recommendation -- watch the videos at 2x speed. The information is actually easier to absorb when it's presented quickly.
I've watched some lectures with really slow speakers at 3x and was still able to understand, and really wondered what the people watching the lecture live at 1x must have felt...
[1] https://chrome.google.com/webstore/detail/video-speed-contro...
That is for lectures that I miss due to a clash, not re-watching.