Nesting is used to style your structure of the stylesheet that matches the HTML structure of the page to reduce the chance of conflicts.
Example:-
ul{
  background-color: #03A9F4;
  padding: 10px;
  list-style: none;
  li{
    background-color: #fff;
    border-radius: 3px;
    margin: 10px 0;
  }
}
In the above code we write css for "li" inside the curly bracket of "ul". 
output:-
ul {
  background-color: #03A9F4;
  padding: 10px;
  list-style: none;
}
ul li {
  background-color: #fff;
  border-radius: 3px;
  margin: 10px 0;
}
In less whenever you have to do nesting, is to just put its child property into its parent backet.
                       
                    
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