Bootstrap Navigation / Header - examples & tutorial. Basic & advanced usage - Material Design for Bootstrap
How to align all but one navbar items left, starting at left margin, with fixed combined min & max width, but with the last item sent to right margin? - Stack Overflow
Fixed left navbar doesn't work - Support - Themeco Forum
How to create a fixed sidebar layout with Bootstrap 4? - Stack Overflow
Use CSS to fix top and left navigation, and scroll content - YouTube
Bootstrap Sidebar Tutorial - Step-by-step tutorial with 5 sidebar templates [updated in 2020]