How to make a fixed left menu like a toaster on bootstrap 4?

Question

Layout

Good afternoon.
Tell me how to make a fixed menu on the left. So that when scrolling the page it was static, and only the content part scrolled?
An example of how it is done on this site (I mean a toaster).
Preferably using bootstrap 4 - if possible

<div class="container-fluid">
  
  <div class="row">
  
    <div class="col-2">Блок меню слева</div> /*Как сделать фиксированным? Чтобы было аналогично fixed*/

    <div class="col-10">Блок контента</div>
  
  </div>

</div>

Answer 1