Bootstrap 4 Multilevel Dropdown Menu on Mouse Hover

Bootstrap 4 Multi Level Dropdown Menu On Mouse Hover
Implementing bootstrap 4 multilevel dropdown menu on mouse hover instead of clicking by using simple modifications that are supported in most broswers.

Collapsible fixed sidebar in Bootstrap 4 Using Collapse JavaScript plugin

Collapsible fixed sidebar in two columns Fixed-Fluid Bootstrap 4 layout using standard Bootstrap 4 Collapse Javascript plugin through navbar-togger button

Implementing two columns Fixed-Fluid layout in Bootstrap 4

Implementing a two columns layout in Bootstrap 4 with one of them fixed in width and height and the other is fluid