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1- You should abstain from bad things all year round everyday. In Ramadan, during the day, you shouldn't eat, drink, smoke or have sex. This will nullify your fast if you do instantly. However, other things such as lying, backbiting..etc it's also bad and you should abstain from it as much as you can.

2- Big dinners are everyday at sunset. Some people/cultures have several meals before dawn, some other prefer to have just one or two.

3- Nobody get gifts. Usually, it's kids who get new clothes during Eid and they also get money gifted to them (usually small change and can range between $1 and $20 depending where you are). During Eid its required to visit family and friend in their home.