basic question

can some1 plz teach or shw me how to use spaces for leopard
im still new to macs and wanted to know how to also do more cool things example like control alt command 8 which is invert colors how do u do more cool things

go to your system preferences.
(applications > system preferences, or in your dock if you haven't moved it)
click "exposé and spaces"
and then hit the spaces tab
if "enable spaces" isn't checked, check it.
from here you can change how many spaces you want, and how to use them.
it should be fairly self explainable, but if you still don't get, don't be afraid to post back for some more help.