<< lets say I wanna give my account apt privileges. even after RTFM'ing and looking at your examples, I dont know what to do exactly. >>
The most direct way would be to add a line to the user privilege specification section:
username hostname=/path/to/apt
Fill in your username, computer's hostname, and path appropriately. That's it - you will be able to type "sudo apt [arguments]" at the command line, enter your password (not the root password), and you're set. All the other aliasing stuff is just to keep things more organized and readable when the permissions settings get more complicated.
For example, say that there are 3 big commands used along with apt (I have no idea, just an example). You could use a command alias to make things more readable, especially if you needed to assign these commands to different users and groups. In the command alias section, add:
Cmnd_Alias PACKAGE=/path/to/apt,/path/to/prog1,/path/to/prog2,/path/to/prog3
Then, instead of having to write out all those commands again in the privilege section, you would use:
username hostname=PACKAGE
If you didn't want to prompted for a password, use:
username hostname=NOPASSWDACKAGE
etc, etc, etc. You should be able to get through the sudoers man page from here. But basically, the aliases are just convenient shorthand - you can do everything in the privilege section if you don't mind typing it all out.
edit: damn smilies - obviously that's supposed to be ": P" at the end there.