css - Bootstrap positioning objects dinamically in columns -


i'm trying display objects in 3 columns using bootstrap 4. when using code appears in 1 column, this: web 1 column.

but idea displayed (more or less): web template 3 columns. 

<div class="row-mt-5">           <div ng-repeat="woman in women">             <div class= "col-lg-4">                 <!--card-->                   <div class="card">                       <!--card image-->                       <img class="img-fluid" ng-src="{{woman.image_url}}" alt="{{woman.name}}">                       <!--card content-->                       <div class="card-body">                           <!--title-->                           <h4 class="card-title">{{woman.name}}</h4>                           <!--text-->                           <p class="card-text"> <h5>{{woman.field}}</h5> <br> {{woman.job}}</p>                           <a href="#!/women/details/{{woman._id}}" class="btn btn-primary">learn more</a>                       </div>                   </div>                   <!--/.card-->             </div>           </div>         </div>

i want learn use bootstrap classes object positioning. thank :)

first need know basic layout structure, learn here, please note need define grid layout screens (sm md lg xl) details found in link provided. please refer below fiddle code fix issue. have included ng-app , ng-controller testing purposes, please ignore that.

html:

<div class="container-fluid" ng-app="myapp" ng-controller="mycontroller">   <div class="row">     <div class= "col-4 col-sm-4 col-md-4 col-lg-4" ng-repeat="woman in women">       <!--card-->       <div class="card">         <!--card image-->         <img class="img-fluid" ng-src="{{woman.image_url}}" alt="{{woman.name}}">         <!--card content-->         <div class="card-body">           <!--title-->           <h4 class="card-title">{{woman.name}}</h4>           <!--text-->           <p class="card-text">              <h5>{{woman.field}}{{woman.job}}</h5>           </p>         <a href="#!/women/details/{{woman._id}}" class="btn btn-primary">learn more</a>       </div>     </div>     <!--/.card-->   </div> </div>

jsfiddle: here


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