The Halakhot of Chol HaMoed are among the loftiest elements, and yet people tend to overlook them. For many, the days of Chol HaMoed feel like ordinary weekdays, which is why it is so difficult to pay attention to all the forms of work that are forbidden during them. This is why we have written this short book, so as to become familiar with the Halakhot of these intermediate festival days and to be able to sense, in some measure, the kedushah that fills them. At the end of the book, we have included 4 chapters on the laws relating to Rosh Chodesh.