Salesforce provides a free account for those looking to learn the platform. So you can sign up for your own Salesforce organization, complete with two Enterprise level user licenses. This is worth roughly $300/month in licensing fees, and enables you to follow along with the lectures of this course.
If you have your own Salesforce account at work, I recommend that you go ahead and take advantage of a free account of your own, that you can keep for life (since you may end up not retiring from the company you are currently with). Having a fresh, new instance of Salesforce also helps you to avoid messing up your Production work environment in Salesforce and to have your own instance more closely resemble what I walk you through.