Machine Learning:
- Friendly introduction to ML (udacity course)
- Analytics Vidhya (blog)
- Machine learning mastery (blog)
- Introduction to tensorflow (youtube)
- Deep learning with TensorFlow (safari course)
- Deep learning (stanford)
NLP:
Khan Academy: https://www.khanacademy.org/
Calculus: http://tutorial.math.lamar.edu/
GATE Discussions: https://gateoverflow.in/