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For the basics read Micheal's Neural Nets & Deep learning - http://neuralnetworksanddeeplearning.com/

The Watch the Caltech telecourse - https://work.caltech.edu/telecourse

Read tutorials on Pytorch, Tensorflow & Keras.

Read, source codes on hugging face and deploys, test, train toy models.

Test your skills by participating in Data scientist competitions like Kaggle or Numerai.

It will give you a great way of guaging your competence with other data scientists.