Describe a video you watched online that taught you something useful

A video that taught me something really useful was a tutorial on how to fix a leaking tap. I found it online about two years ago, when the kitchen tap in my flat started dripping constantly, and the landlord told me it would take at least two weeks before a plumber could come.

I searched for a how-to video on a popular video platform, and the first result was a ten-minute tutorial by a man who looked like a retired plumber. He spoke slowly and clearly and showed each step in close-up. He explained that most drips are caused by a worn rubber washer inside the tap, and that you only need a spanner, a screwdriver and a replacement part that costs a couple of pounds. He also warned viewers to turn off the water supply first, which I probably wouldn't have thought of.

I followed along step by step, pausing and rewinding a few times when I wasn't sure. First I turned off the water under the sink, then I removed the handle, unscrewed the valve and replaced the washer, just as he demonstrated. The whole job took me forty minutes, and the dripping stopped completely. I was really proud of myself, because I'd never done any plumbing before.

The video was clear and straightforward, and it saved me both money and time. It also gave me confidence to try other repairs, and I've since fixed a loose door handle and a squeaky bed using similar tutorials. It's a good example of how useful the internet can be.