Console output

Console output is what you will be looking at when developing tweaks. The might be a way to use a debugger but that's nothing I've used so I will stick to NSLog.

Plug your device into your computer with USB. Open Xcode, click Windows in the menu and choose the Organizer. Your device should show up on the left side and you should also see an option named "console". Click this and you should see a giant wall of text. This is your devices "syslog" and this is where lots of things get logged, including anything that is "NSLogged".

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Keep this in mind, as this is where you will be looking at some point or another.