When I bought my first road bike about a decade ago, I didn't think about things like getting a flat tire. I rolled out of the shop with my shiny new steed and a bag full of "stuff" that I was supposed to know how to use. I played along.
Then I got home and asked Google. Tubes? Tire levers? Whaaaat?
OHHH, I discovered, The tube goes inside the tire. Who knew?
A few YouTube videos later and I kind of had the idea. But there's nothing like trial by fire: being alone on the side of the road, with a flat tire, far from home. Be sure you are prepared!
If you still find yourself with a pile of tools and no idea how to use them, don't worry! You're not alone, and Michelle the mechanic is here to help.