The basic principle of homeopathy is ‘like cures like’. In other words:
a substance taken in small amounts can cure the symptoms it causes if it were taken in large amounts.
For example: raw onion causes symptoms that lookalike a common cold. In homeopathy we use onion as a remedy for some common colds.
The founder of homeopathy- dr. Samuel Hahnemann – called this principle: ‘Similia Similibus Curentur’.

Another main principle of homeopathy is the fact that it does not use pure material substance , because some substances can cause poisoning. Homeopathy prescribes only highly diluted dosage of a remedy, which is safe for humans and animals. Repeated experiments done by dr. S.Hahnemann, showed that diluting a substance in alcohol and water, makes the poisonous effects disappear completely.
It creates a greater potential to cure quickly, profoundly and gently.
Even the most toxic plants can be used, on condition that every degree of dilution is accompanied by shaking a set amount of times. (succussion)

After numerous experiments and years of hard work dr. S.Hahnemann came to these conclusions, and these have been the basis for the development of homeopathy as it is known for more than 200 years. There have been all kinds of development since then, but classical homeopathy means that the method is used according to the founder of homeopathy, dr.Samuel Hahnemann.