I love 3blue1brown videos. I have been watching for a few years now.
I've found that the "visual" intuition about a concept/topic is really great. They are simple, structured, and clear way to represent these concepts in video.
3blue1brown videos really transformed my view on math.
Recently, 3blue1brown drop two new videos in the Deep Learning series:
These video lessons are aimed at non-technical people. If your goal is to understand the ground level of the Transformer and attention idea, then this intutition is good.
3blue1brown is doing everyone a huge favor with these lessons.
YMMV: you're likely in the minority if you found 3blue1brown videos difficult to understand and they give you a worse intuition about a concept than you previously had.