$("button").on("click" , () => {
  let index = !$("section.show").length ||  $("section.show").index() == $("section").length ? 0 : $("section.show").index();
  $("section")                         // all sections
    .removeClass("show")               // remove show class to hide all sections
    .filter("section:eq("+index+")")   // desired section by index
    .addClass("show");                 // show the section
});

// to show spacific section
// index starts from 0 so 0 mean the first section change 0 to 1 or 2 ... and try it
$("section").eq(0).addClass("show");

section{
  display : none;
}
section.show{
  display : block;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<section>section1</section> 
<section>section2</section> 
<section>section3</section> 
<section>section4</section> 
<section>section5</section> 
<section>section6</section> 

<button>Show each per click</button>