Can you tell us a secret?

In virtually every field of endeavor, there are little tips and tricks that the insiders know and use regularly that the public isn't aware of.  For example, in system administration, we save a lot of time configuring PCs by using "imaging" software. Using this software, we "build" one PC with network settings, software, and so forth the way we want it.  We then use the imaging software to create a huge file, or image, of the machine that is stored on a server.  When we need to configure another machine just like it, we reverse the process and copy that image onto the new machine.  Instead of hours spent installing software, adjusting settings, etc., the process takes about 5 minutes.

In your work or hobby, what secrets can you share with the rest of us that might help us do what you do?