Rosh Hashana

The Avodah of Rosh Hashana is Kabbolas Ol (accepting the yoke of Heaven). One should utilize every spare moment to say Tehillim earnestly. Throughout Rosh Hashana, and particularly on the first night, one should avoid all unnecessary idle chatter and minimize sleep.

One should not smoke on the two days of Rosh Hashana. [Of course, this is discouraged in general.]

One should be especially careful not to be angered on Rosh Hashana.