JavaScript is not working when using Bootstrap 5.3

I am building a website on Visual Studio Code and I’m using Bootstrap 5.3, but the functions are not working – buttons not expanding, carousel not rolling, etc. I’m a beginner, so I’ve been struggling to understand why 🙁

Do someone know what’s the issue or had the same problem?

Many thanks!

I used the CDN from here: https://getbootstrap.com/docs/5.3/getting-started/download/

This is what I have in head

*I didn’t start my own JavaScript yet, only have the html and css files.