Where to get data for neural network training?

Question

Neural networks

To train a two-layer perceptron, you need a huge number of images (of the same size) with numbers in their various forms. Where to get them?

Answer 1

Classic MNIST

Answer 2

Imagenet
https://www.kaggle.com/datasets

Answer 3

MNIST + you can rotate it in any way: stretch / compress along the axis, rotate around the center, etc.