Creating a Basic Home Page
After editing your group settings your home page will have a left menu with 3 tabs: Home, Forums, and Files.
Video example
The content area of your home page will include the mission statement and an activity stream (a dynamic listing of content as it is added to the group). Many times groups do not want the activity stream on their home page. In order to remove it you will need to set up a custom home page.
Once you have created the new home page you can customize the content.