These lectures will continue to deal with key concepts. This knowledge is vital for passing the exam and being able to understand latter parts of this course. Again, please be sure to understand the concepts which these terms represent to the best of your ability. As we go through the course you will find me using them in sentences, and you'll need to know them without having to pause to search for their meaning. Learning and understanding these terms and concepts is going to be the most efficient way to go through the course and prepare for the certification.