_assets folder and then reference those as regular assets in your layouts or anywhere else.
Also, I would recommend to take a look at
Hope that helps!
A common practice is to place them in a folder like
assets/js which Jekyll will copy and place into
If you need or want to concatenate/minify JS then you’ll need a plugin like jekyll-assets as @pabloduo has suggested above. You can also use something like Gulp or Grunt to do that for you independent of Jekyll’s build workflow.