Synergyse Google apps training was such an awesome product that Google acquired it and is available natively directly within G Suite as well as via video in your browser.
G Suite Training (aka Synergyse) is a Chrome extension that gives very clear and interactive lessons while you use Google apps. After you install G Suite Training extension, when you’re using any of the G Suite apps (Docs, Sheets, Slides, Forms, etc.) simply click on the training icon. You’ll be presented with a menu that corresponds to the particular app you’re using. G Suite Training is also available via their portal where you can watch the training videos.
Training icon in your extensions:
Training icon in G Suite: 
G Suite Training portal: 