Second, Salah, or ritual prayer five times a day, at dawn, noon, afternoon, sunset, and late evening, which are obligatory unless you haven't hit puberty, are too sick, or are menstruating. Keep it PG, Thought Bubble. Third, Saum, the month-long fast during the month of Ramadan in which Muslims do not eat or drink or smoke cigarettes during daylight hours. Since Ramadan is a lunar calendar month, it moves around the seasons, and obviously it's most fun during the winter, when the days are shorter, and least fun during the summer, when days are both long and hot. Fourth is Zakat, or almsgiving, in which non-poor Muslims are required to give a percentage of their income to the poor. And lastly, Hajj, the pilgrimage to Mecca that Muslims must try to fulfill at least once in their lives, provided they are healthy and have enough money. And there's also more to understanding Islam than just knowing the Quran.