It must be a daunting prospect for a scholar, having to condense a vast store of knowledge into one of these little books, deciding what to include and what must go, but Solomon judges this well. He emphasizes the diversity and continuing evolution of Judaism, correcting common misconceptions about how ancient or orthodox certain aspects of Judaism are. He also lays special stress on the importance of the Holocaust and of the existence of a modern state of Israel in shaping contemporary Jewish thought.
There are plenty of basic facts - descriptions of festivals, etc - included here, as you would expect. It also raises a great many issues and cites a number of authors, making this an excellent place to begin a more detailed study, if you wished.
Solomon writes well, with a light, sometimes even humorous touch, where appropriate. He was a lecturer at Oxford when this book was first published in 1996, but is now retired, I believe. A revised edition wouldn't go amiss. Perhaps he is too busy working on his Penguin Classics Talmud, which is due out soon and should be worth reading. He is not to be confused with the American activist of the same name, although Amazon does exactly that, so that if you click on either author, you get a list of books by both of them. Take it from me, they are very different!