This manuscript aims to share some tips on implementing a flipped classroom, with examples from biology and computational biology. The proposed rules are: - Invert time and Say It, - Identify (or create) resources for learning at home, - Be explicit on the acquisition of knowledge and engage students at home, - Explore active learning in class, - Develop skills of cooperation and sharing, - Evaluate, - Differentiate, - Take care of the logistic and your posture, - Document your flipped classroom, - Share.