Deep Learning Made Simple: What Neural Networks Actually Learn (Layer by Layer)

Image created by author using Figma A visual, step-by-step guide using a cat vs dog classifier - with intuition, images, and Python code Deep learning often feels like magic. You feed an image of a cat into a model… and somehow it confidently says “cat”. But what actually happens inside the neural network? What do layers really learn? In this article, we’ll break it down in the simplest possible way - using a cat vs dog classification problem.