Answers for "bootstrap 4 flexbox grid"

bootstrap col center content

<div class="row">
    <div class="col-4 d-flex justify-content-center text-center">
        // for image and text
    </div>
</div>

justify-content-between bootstrap 4

<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>

display flex usnig bootstrap

<!-- flexbox with justify-content:normal -->
<div class="d-flex">...</div>

<!-- flexbox with justify-content:space-between -->
<div class="d-flex justify-content-between">...</div>

<!-- flexbox with justify-content:space-around -->
<div class="d-flex justify-content-around">...</div>

<!-- flexbox with justify-content:space-center -->
<div class="d-flex justify-content-center">...</div>

<!-- flexbox with justify-content:flex-start -->
<div class="d-flex justify-content-start">...</div>

<!-- flexbox with justify-content:flex-end -->
<div class="d-flex justify-content-end">...</div>