How do I view the available space on my IPad?

Settings, general, about.

Or, in iTunes when you are connected and goto "Devices" in the left hand column, and click on you iPad name. The graphic at the bottom on the page gives you your Capacity and how much space each category is using, and free space available.

Hi
Am biggener using i tunes
I have some qs plzz
If i use another computer to add photo or music to my ipad what will happen
I heared that i will lose every thing
And how to prevent this
Another qs
If i dele the pics in my computer or music what will happen if i connect my ipad to the computer ?
I know these r easy things but i will learn from u