Easiest way to fix a clogged sink?

Have you tried plunging it? The good old typical plunger works well. Typically, sinks clog because something is sitting in the trap, which is the U-shaped pipe under the sink. It could be coffee grounds, food, random debris, you name it. If the plunger doesn’t work, you could remove the trap with household tools and remove whatever is stuck in there. People struggle with baking soda and vinegar and all of these crazy things, but removing a sink trap is typically very easy. If you don’t want to do that, you can use commercial drain cleaners. Just be careful because if you splash that stuff on your skin it will burn you.

I had some luck with clearing up my clogged sink by using a plumbing snake! If you've got physical debris clogging up your drain, using a plumbing snake will help to loosen up that debris. You can get them pretty cheap too.

Baking soda and vinegar worked for me! Pour baking soda down the drain, then vinegar, and let them sit for a while, like 30 minutes or an hour or so. After that, run water to flush everything out, and your sink drain should be good to go. This works best on more minor clogs, and might not be as effective for major blockages.