Introductory overview video for Google Docs: https://youtu.be/6_hJ3R8jEZM
This video is great for those who have never heard or understand the concept of an online, collaborative document.
Short training videos: https://learn.googleapps.com/gmailvids
This is an index page of a bucketload of videos. You can access them by the specific app if you look for Learn by App towards the bottom of the navigation column.
Google apps certification resources: https://edutraining.googleapps.com/
Interested in getting REALLY GOOD at Google Apps so you can be certified? Here ia a beautiful set of lengthy modules designed for people who consider themselves certifiable. It might be helpful for those who have no background in Google Apps to run through a few of these. They are lengthy, but beneficial if you are targeting an app or only one specific part of an app. The chapters nicely break them down.
General support documents for Google: https://support.google.com/docs/?hl=en
This is a multi-layered collection of documentation for using Google Apps. You can begin by selecting the apps in the left column and then narrow it down the specific activities in the application you want to use.
Online support for Google Apps: https://support.google.com/bin/static.py?hl=en&page=top_products.cs&rd=1
This includes everything (Blogger, Wallet, etc.) from Google. It’s all there, just click on “Show All Products” and you will see icons for every product. The support is supplied through a Help Center, Forum Community of other users, or options for contacting support personnel at Google.
Hope you find this useful.