I was using bootstrap 4 and watching a bootstrap 3 course and when i apply what I've watched i see noting happens so after a lot of search i realized that in bootstrap 4 there is nothing called visible-xs, visible-sm, visible-md and visible-lg as well as hidden-* so. I tried read a lot but i can't understand it really well because i'm new to css and bootstrap. what i want is the equivalence of each visible-* and hidden-* in bootstrap 4 (showing elements only on one platform)
my try:
<div class="container">
<div class="row">
<div class="col-md-6 col-lg-3">
<div class="visible-xs">Extra Small Devices</div>
<div class="visible-sm">Small Devices</div>
<div class="visible-md">Medium Devices</div>
<div class="visible-lg">Large Devices</div>
</div>
</div>
</div>