To change the volume without confirmation audio alerts (or with them, if you have de-selected the option in System Preferences), hold down ß when you press the volume button. To adjust volume in smaller increments, press å+ß when you press the volume button.
To quickly search OS X’s Help, press ç+ß+/ and to launch an app without opening windows that were open when you closed it, hold down ß when you launch. paragraph’, ‘Go to beginning', and so on. That doesn’t mean you have to speak them like that, though. Dictation is smart enough to understand natural language, so you can say ‘Go to the beginning of the paragraph’, instead. It’s a small change, and some people prefer to use the abbreviated versions, but it feels more natural, and so makes using Dictation easier.