What are the best sites for learning Data Science?

Hi,

I am beginner in Data Science and machine learning field. I am searching for the tutorials to learn:

What are the best sites for learning Data Science?

Try to provide me good examples or tutorials links so that I can learn the topic "What are the best sites for learning Data Science?". Also tell me which is the good training courses in Machine Learning, Artificial Intelligence and Data Science for beginners.

Thanks