I found this 13 min explanation very helpful in understanding backpropagation (https://youtu.be/c36lUUr864M?t=2520).

First he explains the necessary concepts:

1) Chain Rule

2) Computational Graph

Then he explains backpropagation in these three steps (first in general and then with examples):

1) Forward pass: Compute loss

2) Compute local gradients

3) Backward pass: Compute dLoss/dWeights using the Chain Rule

A spaced repetition flashcard app with the main focus on creating flashcards together. Sharing is still missing, but we are starting to work on it: https://play.google.com/store/apps/details?id=com.space.spac... or https://apps.apple.com/us/app/space-spaced-repetition/id1546....

I'm still a student and started programming the app with a friend because I wanted to learn physics with my classmates. But the other apps Anki, Brainscape and Quizlet have a pretty bad UX to create flashcards collaboratively, so I started working on it.