See that set of nine dots? At the point of the black arrow? That is the Google App Launcher. Click on a Gmail page and see that set of dots. Click on them and you see the beginning of the Google tools available to you. Drive is a drive in the cloud. Voice is for voice and texts for anybody whose number you know and whose phone can receive calls and texts. Photos is cloud storage for photos. There is a ton of great stuff that can be fun to explore. No charge.
Don't have a Gmail page? Do a Google search for Gmail and you can quickly get one.
