It's been true since the dawn of the PC's creation: if you know anything about technology, you end up helping out everyone else every time they have a hiccup or crash with their computer.
The information technology (IT) pros at your office have their specialized tools to assist them. Here's a collection you can take with you, the home-based IT person handling tech support for family, friends, and (if you're really "lucky") friends of friends. This mix of hardware and software should always be on-hand when you need to provide a fix, no matter how complicated—especially for those times that you don't know what you're in for until you arrive.