Did you mean Tensor Flow? First of all, you have to understand what does mean Deep Learning, and then you can learn something about Tensor Flow. As the first step, I would recommend this site www.3blue1brown.com, and watch videos about neural networks, then watch MIT Courses https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-034-artificial-intelligence-fall-2010/lecture-videos/ . When you will be familiar with Deep Learning, you could do this https://www.coursera.org/learn/intro-tensorflow