The initial step to use Docs is to create a site. Go to the main menu on the left side and select Docs. The first time you enter docs, you get asked to create a site. Enter the site type and name.
You can choose between 3 different site types:
Help Center is a classic support style.
Blog is a style to post information.
Documentation is a style for technical documentation
Important note: You can only choose the site type at the beginning. You cannot change it later.
If you want to create additional site click on the New Site button at the bottom of the Docs menu.