This is a really cool, new feature in Calendar. It will actually tell you how long it will take you to get where you are going.
If you need to look through your contacts to find someone's address, here is a quick way to do that without leaving the mail program.
There are many ways to enter a new event. Here are a few.
If you set up the columns in mail just the way you like to work it will save you time on your email.
If you find that you need to get into the library in your user account it is helpful to be able to turn it on so that it is always visible.