I am a big fan of Google tools. There are Google Drive, Docs, Sheets, Sites and a lot more. I became a Google Certified Educator because I use those tools extensively and wanted to learn to maximize the productivity. It can be intimidating to learn all of them at once.
Once you install the extension, you will see a new training menu in your Google Apps. You can tell by looking at the question mark with a Google-colored circle around it. Hit the links below to start learning G Suite!