Document

class="container"

col-sm
One of three columns

col-sm
Two of three columns

col-sm
Three of three columns

class="container-fluid"

col-sm
One of three columns

col-sm
Two of three columns

col-sm
Three of three columns

class="container-fluid"

col-lg
One of three columns

col-lg
Two of three columns

col-lg
Three of three columns

class="container"

col-sm and a «div class="w-100"»«/div»after first column
One of three columns

col-sm
Two of three columns

col-sm
Three of three columns

class="container-fluid"

col-lg-2 col-md-4 col-sm-2 col-xs-12 border-f
One of three columns

col-lg-2 col-md-8 col-sm-10 col-xs-12 border-f
Two of three columns

col-lg-8 col-md-4 col-sm-2 col-xs-12 border-f
Three of three columns