Все подключено верно, проверял несколько раз.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel='stylesheet' href='css/style.css'>
<link rel='stylesheet' href='css/slick.css'>
<link rel='stylesheet' href='css/slick-theme.css'>
</head>
<body>
<div class="container">
<div class="box">How are you dude???</div>
<div class="box">How are you dude???</div>
<div class="box">How are you dude???</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="js/slick.min.js"></script>
<script>
$('.container').slick({
infinite: true,
slidesToShow: 1,
slidesToScroll: 1
});
</script>
</body>
</html>
.container{
}
.box{
border:3px solid black;
width: 400px;
height: 400px;
}
