Preview works but the published website does not

Hey there, I have to create a website for uni and I’m a total scrub. My Website does look like I want to in the Preview but once published it’s kinda bad and nothing works.
Need urgent help!
https://preview.webflow.com/preview/vajejo-319c85?utm_medium=preview_link&utm_source=designer&utm_content=vajejo-319c85&preview=c261db517449378fd731b45032431775&mode=preview