Academic freedom is not academic license. Do not use classes as political forums for research specialties. Check occasionally with people in the back row to see if they are hearing your words and seeing your visualize adequately. Let humor arise from the interaction of the class. The use of profanity and slang usually offends students.
Profanity can interfere with the teacher's image as a positive model.
Be available outside class for consultation. Keeping regular office hours is important. Expect good attendance and keep a seating chart even if only for occasional use. It humanizes the class atmosphere and makes students more accountable to the goals of the syllabus. Do not be afraid to say you do not know the answer to a question, but be sure to research the answer as soon as possible.