GitHub - fedecarg/sticky-nav: A simple, lightweight and performant jQuery plugin to fix a navigation bar and highlight navigation items when scrolling a Single Page Application (SPA)
Pure CSS Sticky Header - Navbar Fixed Top After Scrolling - No Javascript - YouTube
Bootstrap 4, navbar fixed-top and other sticky-top elements - Stack Overflow
Bootstrap Navigation / Header - examples & tutorial. Basic & advanced usage - Material Design for Bootstrap
Sticky Navigation Bar with jQuery and Bootstrap | Free jQuery Plugins