Sanghamitra
Buddhism grew from the teachings of Siddhartha Gautam, the Buddha (hence BUDDHism). Some of his main teachings were karma, the Four Noble Truths and the Eightfold Paths.
Buddhism
No, "preach" is a verb that means to speak or deliver a sermon or religious teachings. A noun form related to this verb is "preacher," which refers to someone who delivers religious teachings or sermons.
Siddhartha Gautama is the Buddha and the founder of the teachings that comprise Buddhism.
Desire is the cause of poverty in buddhism people suffered because of desire
Buddhism is a variety of beliefs and practices based on the teachings of Siddhartha Gautama
The religious symbol for Buddhism is the teachings of the Buddha or the Three Noble Jewels.
I am assuming that what you are asking is how does Buddhism today compare to what the Buddha taught. Buddhism over the years has been enriched by each culture that has been exposed to; changing the nature of practice just slightly each time. So Chan Buddhism (China) is slightly different in practice then is Zen Buddhism (Japan, Korea). But the teachings have always remained the same. Now when I speak of practice, it is the methods used to teach the Dharma (the teachings). The biggest change in Buddhism since the Buddha is the development of Mahayana Buddhism. Mahayana Buddhism, to which is the tradition I practice, added teachings from later Buddhas and Bodhisattvas to The Buddha's original teachings in regards to living a compassionate life to help all other beings. So Buddhism adapts the methods but never the message or teachings.
There are really only 2 distinct types of Buddhism, though there are subgroups to them. The two major groups are Theravada and Mahayana. Theravada is call the "teachings of the Elders" and is most closest to the original teachings of the Buddha. Mahayana incorporates teachings of later Buddhas and Bodisatvas into the Buddhas original teachings. All the differnt lineages of Buddhism fall within one of these two groups but all teachings agree as to what the Buddha taught and to what the objective of Buddhism is.
Siddlartha
Buddhism