Yes you should understand backprop

Backpropagation is a leaky abstraction that requires deep understanding to build effective neural networks. Common pitfalls include vanishing gradients with sigmoid activations, dying ReLU neurons that never activate, and exploding gradients in RNNs. A real-world example shows how a DQN implementation incorrectly clipped values instead of gradients, causing training bugs. Understanding the backward pass mechanics helps developers debug issues, choose proper initialization strategies, implement gradient clipping correctly, and avoid architectural mistakes that prevent learning.