The core benefit of using G Suite is a great set of tools for collaboration, for example, an ability to create shared calendars and documents. But, before creating and sharing those, more Apps users should be added to your Google Apps account.
NOTE: These instructions are for G Suite accounts purchased directly from G Suite official website.
To add more users to your G Suite account:
1. Go to your Google Admin console.
2. Click Start in the dashboard of your main Google Apps account:
3. On the next step, specify the new user's First name and Last name as well as username. Click on the Add button.
If you don’t need to add any other email addresses, check the box 'I added all user email addresses currently using @yourdomain.com and click Next:
The admin user will be able to see all the created users.