Wait, they showed a sink install without a drain pipe? How does that even work, you just pour water into a hole? That's not just wrong, it's a flood waiting to happen. Who makes this stuff? It's one thing to get a step out of order, but leaving out the main part that makes the thing function? That's crazy.
Oof, that's rough. Those deepfake guides are way too convincing these days, but the steps are usually nonsense. I remember one that showed how to install a sink without connecting the drain pipe properly. You'd end up with water everywhere. Always double-check with a known good website or book before following any video tutorial.