Cliff Isberg, the author, evolved this website starting in 1995 to express his understanding of Buddhism, and particularly of Zen practice within the nexus of scientific and mystical religious traditions.. His daughter Terry designed and integrated the website's aesthetics. He was a student of Jikoji's founder Kobun Otogawa from 1970-2002, then of Jikoji's Guiding Teacher Shoho Michael Newhall, receiving Dharma transmission from Shoho in 2014. He also collected Kobun's Teachings starting in the late 1990s. His Dharma Talks at Jikoji began in 2010. Life Story is his prospective obituary.
Buddhism, in a Nutshell attempts to clearly identify key tenets of Buddhism in a way that is not cut and dried, but not necessarily warm and fuzzy either. My "nutshell" evolved from a handwritten page, circa 1980, by Angie Boissevain, a teacher of Zen in the lineage of Kobun Chino Otogawa Roshi.
Most of the information accessible from my links from "nutshell" is described further in my review of Right, According to Buddha, that roughly summarizes Thich Nhat Hahn's book "The Heart of Buddha's Teaching". It also reflects insights from related books that attempt to represent Buddhism, rather than teachings from one particular sect or or school within Buddhism. I used particularly "One Dharma", by Joeseph Goldstein, "Eight Mindful Steps to Happiness" by Bhante Henepola Gunaratana, and "Being Upright" by Reb Anderson. My favorite basic books on Zen, and on meditation, are described in Favorite Authors.
Note that there is no central authority, and no particular beliefs or commandments in Buddhism. For any given aspect, you will find several alternative translations and, on the web, several hundred sometimes conflicting opinions. Buddhist practices are open to interpretation, teachings differ widely, and there many Buddhist schools and sects, but no single central Buddhist organization.
A few links to web sites that are relevant and/or local follow. (There are probably millions of related documents, and thousands of web sites relating to Buddhism.)