Hidden keys for typing

So, there are hidden keys on the virtual keyboard on the iPad. For example, if you want to type in ALL CAPS all you have to do is double tap the shift button (that's the up arrow). Another I always need is the apostrophe; I really hate switching between keyboards. Instead tap and hold the ,/! Button and the ' shows up by just sliding your finger over it. You don't even need to lift a finger. Finally, By double tapping the space bar you come to full stop and it will automatically space for your next sentence. It is like telling the iPad that you are done with that thought on to the next! I wish I would have known about these short cuts earlier...I hate switching screens!