I’m trying to learn from the Play and Edit Mode lesson from Interactive Tutorials, and the first thing it says is to open Unity and go to the Learn tab. However, there is no Learn tab! A Getting Started tab takes its place. I updated Unity to the latest version, btw, which is apparently version 5.4.5p5.
The latest version is 2018.1.6 (Download - Unity Store)
I can see the Learn tab in the latest version. They may have just renamed Learn to Getting started in your version of unity.