Hi!
I am a very visual person and I get a lot of information and intuition when I actually "see" things, so I found this video of 3blue1brown really useful for understanding what backpropagation is doing.
https://www.youtube.com/watch?v=Ilg3gGewQ5U&t=267sI post it here in case anyone else finds it useful.
In general, I found this 4-part series on neural networks very helpful as the animations provide a nice visual complement to give more insight on what's happening.