Laws of work, forbidden on Yom Tov.
1. The majority of works, forbidden for Shabbos, are forbidden on holidays as well. There are however some exceptions, including cooking, lighting the fire and carrying objects outside our homes. Let us look at each of them closer.
2. Although on Shabbos one is forbidden to light or increase the fire, on a Yom Tov it is permitted to light the fire from an already burning one, and also, to increase it. However, one is still forbidden to reduce or to extinguish fire. In case the fire is too big for a certain dish, one should cover it with a metal dish or tray, to reduce its power, but not the fire itself. If it seems impossible for some reason, most Rabbis advise to light a second burner, from an already burning fire, rather than reduce this one. Lighting fire for no reason is still forbidden. This is the general rule: even the permitted types of work have to be done only for immediate purpose of a Jew during this days of the holiday. That is why making fire for use after the holiday, carrying objects for use after the day is over, or cooking for non-Jew is forbidden.
3. One may carry objects, only if he needs them. If one brought a Siddur to the synagogue, and has no place to store it after the service, he may carry it back home, although he won’t need it any more on this day. The reason for this permission as follows: if one would not be able to take his Siddur back home, he might decide not to bring it to the synagogue in the first place.
4. Cooking is allowed on holidays. One is allowed to knead and bake the dough, and one is allowed to separate challah from it. However, if the dough was prepared before the holiday, challah can not be taken from it on Yom Tov. On Shabbos, if one has a mixture of objects, he can only take out those objects that are needed now. On holidays one is also permitted to take out those objects that are not needed and to leave what is needed, if this is easier. Also, on holidays there are certain leniencies regarding crushing and sieving foods, but regarding the exact details, one should consult a Rabbi.