JSFiddle - React, Tailwind, and code Playground

HTML

<a data-target=".fblc">показать первый блок</a><br>
<a data-target=".sblc">показать второй блок</a>

<div class="fblc block">11111</div>
<div class="sblc block">22222</div>

CSS

.fblc {
    width:100%;
    border:1px solid red;
}

.sblc {
    width:100%;
    border:1px solid green;
    display:none;
}

JavaScript

$( document ).ready(function() {
    $(document).on('click', "a", function(e){
        e.preventDefault();
        
        var $target = $( $(this).data("target") );
        
        $('.block').hide();
        $target.show();
    });
});