Knowing your subject and audience is a crucial part of effective communication during a lecture or presentation. Having comprehensive knowledge of the subject you are teaching is key to being comfortable during the lecture. Study your subject and practice the topic until you can’t get it wrong. Amateurs train until they get it right, professionals train until they can’t get it wrong. The first few times that you present to a live audience may be daunting, the more you perform it, the more comfortable and proficient you will become. Understand the type of audience you are communicating with. Are these industry professionals that already have comprehensive knowledge in the field you are teaching or are they totally new to the subject? Visual aids and any type of hands-on interactions will keep people interested and can create good discussions. Encourage questions and converstion. Pull from your audience’s knowledge and personal experience to keep them focused and engaged.