Gmail is Google Email. You access your Gmail from your google account from a web browser. All your emails in Gmail are stored in the cloud, therefore you can access your email from any computer using any browser in the world.
You can access your Gmail several different ways.
In this video you will explore the Gmail interface by understanding the inbox and how to organise how you would like the inbox to look.
Labels can be seen as folders to place different types of email. This video will explain how to create these labels.
A filter run a set of rules on your emails as they come into your inbox. For example you may want to set up a filter that will place all you emails from your head teachers into it's own label.
Google Hangouts make communicating very easily. Rather than sending an email with a quick message, send a Google Hangout message. This is an effective way to have live conversations with those in your school and beyond. Think of it like Facebook Messenger.
Click the G-Suite Training icon and find some interactive training exercises on what you have learned about Gmail.