PSA: HOMEOPATHY IS FAKE. It's not real medicine. It's water or sugar and nothing more. Do you want to know how homeopathy "works"?

Homeopathy "works" on the principle that like cures like, that something which causes a symptom will, when sufficiently dilute, cure that symptom in the body.

Let's say you're suffering from insomnia. You might take homeopathic caffeine (or honest to god, homeopathic owl) to help you sleep.
That's kind of crazy BUT IT GETS BETTER.

The more dilute a homeopathic remedy, the more potent it is meant to be.
So they take the active ingredient and they dilute it in water. Then they take a drop of that water and dilute it in some more water. Then they take a drop of that water and dilute it in more water.....then they do that again and again and again until there is not even ONE SINGLE MOLECULE of the "active" ingredient remaining in the water....and they call that medicine and sell it to you.

Tl;Dr: What homeopaths call "medicine" most of us just call "rinsing"