The Idiots Guide to Homeopathy couldn't have been more aptly named.
Homeopathy is idiotic. According to its inventor and all those who claim to understand it, the more dilute a substance the more potent will be its medicinal efficay. So it is not uncommon to see dilutions of 20C and 30C.
Homeopaths will skate over the physical problem of high dilutions in the real world and, not uncommonly understate what the numbers and letters actually mean. For example a 30C dilution is not diluted 30 times, as your homeopath might tell you, or 300 or even 3000 times.
Here's how it works:
A 1C dilution is one part ingredient in 100 parts solution (usually water). A 2C dilution isn't 1 part on 200 parts solution... it is 1/100th part of of a 1C dilution diluted again in a 100 part solution of water. So while a 1C dilution should be 0.01 ingredient (1/100th part) a 2C dilution is in fact 1/100th of 1/100th part. That is 1/10,000. Already!
Now keep taking 1/100th part of each successive dilution, for 30 times, and we end up with a 30C dilution which is in reality 1 part water to 0.0000000000000000000000000000000000000000000000000000000000001 part ingredient.
What this actually means is that in order to find a single molecule of active ingredient, you would need a sphere of the 30C diluted homeopathic remedy with a diameter equal to the distance from the Earth to the Sun. That is approximately 93 million miles (150 million kilometres).
For a 200C dilution there simply aren't enough molecules in the known universe.
Homeopaths overcome this by telling you that water has a memory. In reality water has no memory - otherwise it would have a memory of everything it ever passed through, including your bladder, and not just the selective memory a homeopath might like.
Oh yes, I must not forget the procedure I've missed out during the dilution process. That is, every so often between dilutions the container holding the liquid must be "succussed" (that's "banged" or "hit" to you and me) against a solid leather object (like a leather bound bible, or something like that). Apparently it "potentizes" the remedy.
If you are wondering how homeopathic pillsd are made (which are supposed to have a memory of the memory of the water!), you put your open container of cheap sugar pills in the same room as your open container of diluted "remedy". Yes, that's really it. This is what the makers of homeopathic remedies do.
As I said at the beginning, homeopathy is idiotic. It is an idea from just over 200 years ago when medical science was in its infancy, germ theory wasn't really known, while molecular and atomic structures weren't even known let alone understood. The inventor of homeopathy was Samuel Hahnemann, and he was profoundly mistaken. There is no evidence to support anything homeopathic, not the diluted remedies, the notion the "like cures like", nothing.
Now, in the light of what we know of about the universe, our physical world and how our bodies work, there is no doubt that homeopathy is fraudulent medicine. In some circle is it described as "alternative medicine", but since there is no such thing (it either works in which case it is medicine, or it doesn't work in which case it isn't medicine) it would be better described as Alternative Reality Medicine.
Homeopaths currently can't make up their minds as to whether their quackery can be tested scientifically or not. They present anecdotes as evidence. They present satisfaction surveys as evidence of efficacy. They misrepresent and cherry pick report to show that even statistical anomalies and insignificances (i.e. chance) in a poorly designed trial are apparently evidence of efficacy. But not only is there no scientific data to support homeopathy, there are no actual real life or recorded cases that stand up to any scrutiny. There are only anecdotes and unsupported claims.
Homeopathy as generally sold to the public has never cured a single ailment, because it can't. Homeopathy is either water or sugar. At the absolute lowest dilution, where there is some detectable ingredient, there is some minor prospect of Arnica having some effect. But what homeopathy is usually claimed to cure actually requires no intervention and will get better of its own accord. As regard to non-self-limiting ailments homeopathy is even more useless, and in fact dangerous. Of course you the homeopathic user are free to fool yourself, and be parted from your money.
In reality though any scientifically literate individual, even to basic school standard, and armed with the knowledge of what homeopathy is (and isn't) can only conclude there are two types of homeopath (for which incidentally no qualification is legally required) - those who are deluded and those who are deceitful and dishonest.