First import Bootstrap as a link in the head tag of the HTML file.
<head>
[...]
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</head>
Then make this where the carousel shoul be.
<div id="carouselExampleSlidesOnly" class="carousel slide" data-ride="carousel">
<div class="carousel-inner">
<div class="carousel-item active">
<img src="https://stackoverflow.com/questions/61577686/[PATH_TO_IMG]" class="d-block w-100" alt="[ALTERNATIVE_TEXT]">
</div>
<div class="carousel-item">
<img src="https://stackoverflow.com/questions/61577686/[PATH_TO_IMG]" class="d-block w-100" alt="[ALTERNATIVE_TEXT]">
</div>
<div class="carousel-item">
<img src="https://stackoverflow.com/questions/61577686/[PATH_TO_IMG]" class="d-block w-100" alt="[ALTERNATIVE_TEXT]">
</div>
</div>
</div>
If you want to make 4 Images in your slideshow than you have to make this 4 times: named as [1] by me.
<div class="carousel-item">
<img src="https://stackoverflow.com/questions/61577686/[PATH_TO_IMG]" class="d-block w-100" alt="[ALTERNATIVE_TEXT]">
</div>
If you want buttons, put this after the last block of [1]:
<a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>