Keyboard shortcuts can save you unbelievable amounts of time. Every app in OSX is full of keyboard shortcuts to help you be more productive. CheatSheet is a simple OSX app that I use every day. You can pick up the app from the folks at Mediaatelier.
Once you install the app just hold the ⌘-Key a bit longer to get a list of all active short cuts of the current application. It's as simple as that. You will love this app!