Hello,
This is not really a tutorial, but only a single page with the custom code needed to detect if user is browsing throught mobile device or not.
I know this method is not ideal and somewhat controversial, but it fits my needs and might help anyone out there as well 
So, without further ado:
https://mobile-detect.webflow.io/
And the clonable project:
https://webflow.com/website/Mobile-detecttion-with-JavaScript
