Travelling to Middle Eastern Do's and Don'ts's

Hi! I'll be travelling to Saudi Arabia for a Business trip this April. I know it's a Muslim country and they might be more strict to clothes, culture and other things. I wanna know your honest do's and don'ts when visiting Middle Eastern countries as I wanna be more prepared. Looking forward to hearing your thoughts and tips especially from people who have been there.

Edited: I'm a Female. Travelling to Riyadh.