Getting Started with TensorFlow Basics
Please refer to Xu Qihua's article https://www.cnblogs.com/denny402/p/5852083.html
He wrote in more detail, so I won't rewrite it.
About the difference between tensorflow operations and operations in python
In fact, the difference between tensorflow and python
tensorflow is a computational graph architecture. The core is to create a computational graph and run the computational graph.
And python is a language.
So about the operation, you can directly write the layer x = 1, y = 2, z = x + y
But not in tensorflow, you must create a computational graph first, and then run the computational graph.