Using Gnome 3.x to View Folders
In Fedora 15 and above, click on the filing cabinet icon on the favourites list:

This will open up the File Manager window, showing the available drives, bookmarks, etc in the left hand pane - and the contents of the currently selected item on the right:

In Linux Mint 12 and above, click on the shell icon on the favourites list:

This will open up the File Manager window, showing the available drives, bookmarks, etc in the left hand pane - and the contents of the currently selected item on the right:

Simply, double click a folder to display it's contents:

The default is to display files and folders as icons as above; to display them in a list fashion , choose:
View → List

This will show you more information about the file, like it's size and the time/date it was last updated:

Double-clicking a file will normally open it up in whatever application it was created in (-or run it, if it's an executable). If you right-click a file, you can do things like selecting which application is used to open the file, create a copy, rename it, delete it, etc:
Double-clicking a file will normally open it up in whatever application it was created in
