Usually, when something goes wrong with your iPhone or Mac, the first move is to an Apple Store to get it looked at by a professional.
But the Apple store can be expensive for repairs, and often, minor problems can be solved at home with stuff you already have lying around.
Over the past 8 years, Apple users have found all sorts of clever hacks to fix your iPhone without going out and buying pricey parts or accessories. Some hacks can even make your iPhone better than it was out of the box.
So the next time you're having iPhone issues, try a DIY solution first. Not only will it save you a trip, it could save you some cash.
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If your TouchID is feels sticky or isn't working right, don't take it to a shady shop to get fixed (that can seriously mess up your iPhone.) Instead, you can use a Q-tip for its intended purpose with a little bit of rubbing alcohol to get your home button working like new.
There's a lot more information on this Apple Support thread.
If your iPhone is charging slowly, one problem it could be is that lint is packed into the corners and sides of the Lightning charging port. One thing you can try is to use a skinny tool like a toothpick to remove all the crud from it.
This is how much lint was removed from a single iPhone.
If your phone's earpiece sounds like it's too quiet, there's a good chance lint is simply in the way. You can rub a pencil eraser over your speaker's grill to clear out debris.
Apple suggests you use a "brush to gently clear any debris from the speaker," which is certainly more sanitary, but less fun. One person on the iFixit forums helpfully suggests you can put your mouth over it and suck a little for a tool-free fix. It's gross, but it works.