've compiled a list of shortcut keys for Google+ below. They really help you move through the interface and help avoid some display bugs that occur when just using the mouse.
Google+Timing helps you decide when it is the best time to post. By analyzing your historical post data, we can show you when you have had the most impact with your posts. This in turn will hopefully give you better access to your audience.
Are you new to the Google+ platform? If so, check out the main documentation page. To download client libraries or starter projects, visit the download page. If you're looking for help with the Google+ platform, visit the official Google group.