Rather than use the mouse to browse to a location to open or save a particular file, try to learn these handy keyboard shortcuts instead to save time and make you more productive when opening or saving a file.
Spacebar – View the selected item in Quick Look
⌘+D – changes focus to your Desktop
⌘+Shift+A – Changes focus to your Applications directory
⌘+Shift+H – changes focus to your Home directory
⌘+Shift+N – Creates a new folder.
⌘+Shift+Period (.) – Toggle hidden files & folders on and off.
⌘+Shift+G – Brings up Go To Folder window
Tab – Tab key auto-completes paths and file names from the aforementioned Go To window
⌘+R – Reveals the file in Finder
⌘+F – Move the cursor to the Find field
⌘+Period (.) – Close the Open/Save dialog window