don't understand how javascript is found in bootstrap

[Tom Cloyd]

I'm very new to bootstrap, and know next to nothing about javascript. I'm creating a static site and don't need it. However...

I'm using the "Theme template for bootstrap" available at the Bootstrap site as the basis for my static site. Since I don't need js I didn't copy the *.js files in the supplied "Theme Template for Bootstrap_files" directory into my development site. I DID copy the css. But then main navigation doesn't collapse down in small viewports - like my moto g phone.

When I copy that "Theme Template for Bootstrap_files" directory into my development site root, the main nav collapse in small viewports works fine.

MINOR QUESTION: So, somehow javascript IS being used, although I can't see how. Can someone explain this to me?

CRITICAL QUESTIONS: All I have in my development site is a single html file and AN "../asset/" dir containing css etc. I want to put the theme js fileS in "../asset/js/" but I have no idea how to tell whatever is needing the js files that that's where they are. How do I do this?

Thanks in advance for any help you can offer. I'm really clueless about this.

Tom C.