Any video with 3blue1brown is worth a watch, in my opinion. I also quite enjoy Numberphile, but Grant (3b1b) has such a fantastic way of introducing and teaching topics.
Viewers with even the slightest interest in math, and are not familiar with 3blue1brown, should check out some of his other videos at [1]. Not only is he a great orator, but the visuals he provides have really clarified some of the tougher subjects for me.
I third this recommendation. Have found his expositions to be more comprehensible (and often more intuitive) than most professors’. His visual style of presentation also helps me a lot!
I really am jealous of students today that have access to supplemental study material like this. Learning from an instructors scribblings on a chalkboard or a single image in a textbook is nothing compared to these types of videos.
There was a series on PBS (late 80s/early 90s. If I had to guess, it was a WGBH production) on physics that really helped my understanding of topics that might have been a little fuzzy from classroom lectures and textbook readings. However, even as well as that series was produced, it moved around a lot and was only so many episodes.
Today, there's not just one person, but multiple people making videos like this with so many more videos covering so much more ground. You get the advantage of hearing the same thing from different voices that might say it in just the right way that makes it click for you.
Viewers with even the slightest interest in math, and are not familiar with 3blue1brown, should check out some of his other videos at [1]. Not only is he a great orator, but the visuals he provides have really clarified some of the tougher subjects for me.
[1]https://www.youtube.com/c/3blue1brown