Google, like many other tech companies, is constantly updating the way their products work. For the most part they get better, but it can be hard to keep up with the changes, and sometimes it is frustrating when something doesn't work the way you expect it to work because someone made a change without telling you. Google apps update blog and sites like Android Police are good places to keep up with some of these changes. Occasionally I'll share their posts here when something big comes out. The two links below are examples of some good changes coming with Google products that can streamline the way you work and communicate.

First you can now open files from Google Drive with apps that are installed on your computer. PDF files for example may not be completely functional when opened in Chrome's browser viewer. You will need to install the Drive App to make this work, so it may not be practical on a public computer or your work computer, but it is a handy feature.
http://googleappsupdates.blogspot.com/2015/08/launch-desktop-applications-from-google.html?m=1

Second, Hangouts is getting an update that will bring its user interface, or UI up to speed with most of the rest of Google's products. While it may seem confusing at first, the goal is to get products like Gmail, Drive, Hangouts, and Contacts to have a similar look and feel making them all a little more intuitive and easy to use.
http://www.androidpolice.com/2015/08/13/a-closer-look-at-the-design-of-hangouts-4-0/