First, let's personalize our Mac. Go to the Apple logo (upper left corner) and select 'System Preferences' from the pull down menu:
A so-called 'Window', filled with icons, will appear:
First, choose 'Keyboard and Mouse' and adjust the speed of your little rodent as you see fit:
Or in case you have a Mighty Mouse (multi-button scroll mouse):
Or a trackpad (laptops):
Now, click "Show All" to go back to the System Preferences.
Next, choose 'Dock' (the transparent collection of icons at the lower midst of your screen)
You can choose on which side you want the Dock and adjust its size. You can also make it disappear. When you move your mouse to the bottom of your screen, it will reappear. Change your Dock preferences anyway you like, you can always change it back:
Sound
Now choose the Sound panel and choose your favorite error effect at 'Sound Effects':
In case you don't like the user interface sound effects, you can turn them off here.
Mouse, Dock and Sound are very important for the look and feel of your Macintosh.
