https://letzgro.net/blog/creating-ai-using-python/
https://data-flair.training/blogs/python-ai-tutorial/
https://machinelearningmastery.com/tutorial-first-neural-network-python-keras/
http://neuralnetworksanddeeplearning.com/chap1.html
and for multiple layer (hidden layer) Artificial Neural Network tutorial, I used this one >>
https://mattmazur.com/2015/03/17/a-step-by-step-backpropagation-example/
https://ujjwalkarn.me/2016/08/09/quick-intro-neural-networks/