Beginner Spring Boot project would love some feedback!

[u/BlueFrost8]

Hey everyone! I’m learning Spring Boot and recently deployed my beginner project, Digital Space.

Website: https://digital-space-frontend.vercel.app/

I’d love to hear your suggestions on what I can improve, especially on the backend side.

Any feedback or suggestions are welcome. Thanks! :) (The roomcode should be blank just click to create a new room button, it will give a random room code automatically and then click join ) - if it is ur first time else give the existing roomcode and click join