Using an LMS might require a mindset change on your part. Depending on whether you are a business person or a teacher, you can go either direction on these terms.
If you are a teacher, consider yourself to be a business.
Your students are your clients or customers.
Your lesson content and classroom are your website.
A quiz is simply an interaction, a question you ask of your student/client.
Work both Directions
I think it helps to think of yourself as a bit of each. You want your students to learn, but you also want your customers to be happy with the information you provide them.
As a teacher, you have the opportunity to widen your classroom beyond your school. You shouldn’t be ashamed to earn some extra money by teaching students from around the world. As a business person, you have the opportunity to educate your customer base, potentially leading to more sales.