Sefer Ha’mitzvos Ha’Katzar (The concise book of mitzvos) By the Chofetz Chaim
This book lists the Torah mitzvos that can be observed today
Second Section – the Negative Commandments
149. It is a negative commandment “do not do any work on the holiday of Shavuos”
As it states in Vayikra (Leviticus) 23:21, “You shall call this day a day of holiness for you. You shall not do any work.”
This applies in all places and at all times, for men and for women.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 