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Any Prerequisites to GraphQL Course?

Hi everyone. I'm looking to start the GraphQL Introductions Course (https://teamtreehouse.com/library/introduction-to-graphql), but am not sure what I should already know before starting it. I don't see any prerequisites, but that course is also listed as intermediate, and I have very little knowledge of servers and backend web stuff. However, I do know quite a bit of HTML, CSS, and JS, so I'm really not sure what I need. Thanks in advance for any help!